mirror of
https://github.com/irungentoo/toxcore.git
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2856 lines
87 KiB
C
2856 lines
87 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2016-2018 The TokTok team.
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* Copyright © 2013 Tox project.
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*/
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/**
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* An implementation of the DHT as seen in docs/updates/DHT.md
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*/
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#include "DHT.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "LAN_discovery.h"
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#include "logger.h"
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#include "mono_time.h"
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#include "network.h"
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#include "ping.h"
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#include "state.h"
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#include "util.h"
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/** The timeout after which a node is discarded completely. */
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#define KILL_NODE_TIMEOUT (BAD_NODE_TIMEOUT + PING_INTERVAL)
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/** Ping interval in seconds for each random sending of a get nodes request. */
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#define GET_NODE_INTERVAL 20
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#define MAX_PUNCHING_PORTS 48
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/** Interval in seconds between punching attempts*/
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#define PUNCH_INTERVAL 3
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/** Time in seconds after which punching parameters will be reset */
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#define PUNCH_RESET_TIME 40
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#define MAX_NORMAL_PUNCHING_TRIES 5
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#define NAT_PING_REQUEST 0
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#define NAT_PING_RESPONSE 1
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/** Number of get node requests to send to quickly find close nodes. */
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#define MAX_BOOTSTRAP_TIMES 5
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typedef struct DHT_Friend_Callback {
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dht_ip_cb *ip_callback;
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void *data;
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int32_t number;
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} DHT_Friend_Callback;
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struct DHT_Friend {
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uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE];
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Client_data client_list[MAX_FRIEND_CLIENTS];
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/* Time at which the last get_nodes request was sent. */
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uint64_t lastgetnode;
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/* number of times get_node packets were sent. */
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uint32_t bootstrap_times;
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/* Symmetric NAT hole punching stuff. */
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NAT nat;
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uint16_t lock_count;
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DHT_Friend_Callback callbacks[DHT_FRIEND_MAX_LOCKS];
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Node_format to_bootstrap[MAX_SENT_NODES];
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unsigned int num_to_bootstrap;
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};
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typedef struct Cryptopacket_Handler {
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cryptopacket_handler_cb *function;
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void *object;
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} Cryptopacket_Handler;
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struct DHT {
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const Logger *log;
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Mono_Time *mono_time;
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Networking_Core *net;
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bool hole_punching_enabled;
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Client_data close_clientlist[LCLIENT_LIST];
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uint64_t close_lastgetnodes;
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uint32_t close_bootstrap_times;
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/* DHT keypair */
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uint8_t self_public_key[CRYPTO_PUBLIC_KEY_SIZE];
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uint8_t self_secret_key[CRYPTO_SECRET_KEY_SIZE];
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DHT_Friend *friends_list;
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uint16_t num_friends;
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Node_format *loaded_nodes_list;
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uint32_t loaded_num_nodes;
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unsigned int loaded_nodes_index;
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Shared_Keys shared_keys_recv;
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Shared_Keys shared_keys_sent;
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struct Ping *ping;
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Ping_Array *dht_ping_array;
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uint64_t cur_time;
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Cryptopacket_Handler cryptopackethandlers[256];
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Node_format to_bootstrap[MAX_CLOSE_TO_BOOTSTRAP_NODES];
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unsigned int num_to_bootstrap;
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};
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const uint8_t *dht_friend_public_key(const DHT_Friend *dht_friend)
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{
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return dht_friend->public_key;
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}
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const Client_data *dht_friend_client(const DHT_Friend *dht_friend, size_t index)
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{
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return &dht_friend->client_list[index];
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}
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const uint8_t *dht_get_self_public_key(const DHT *dht)
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{
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return dht->self_public_key;
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}
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const uint8_t *dht_get_self_secret_key(const DHT *dht)
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{
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return dht->self_secret_key;
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}
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void dht_set_self_public_key(DHT *dht, const uint8_t *key)
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{
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memcpy(dht->self_public_key, key, CRYPTO_PUBLIC_KEY_SIZE);
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}
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void dht_set_self_secret_key(DHT *dht, const uint8_t *key)
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{
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memcpy(dht->self_secret_key, key, CRYPTO_SECRET_KEY_SIZE);
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}
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Networking_Core *dht_get_net(const DHT *dht)
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{
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return dht->net;
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}
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struct Ping *dht_get_ping(const DHT *dht)
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{
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return dht->ping;
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}
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const Client_data *dht_get_close_clientlist(const DHT *dht)
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{
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return dht->close_clientlist;
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}
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const Client_data *dht_get_close_client(const DHT *dht, uint32_t client_num)
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{
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assert(client_num < sizeof(dht->close_clientlist) / sizeof(dht->close_clientlist[0]));
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return &dht->close_clientlist[client_num];
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}
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uint16_t dht_get_num_friends(const DHT *dht)
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{
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return dht->num_friends;
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}
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DHT_Friend *dht_get_friend(DHT *dht, uint32_t friend_num)
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{
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assert(friend_num < dht->num_friends);
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return &dht->friends_list[friend_num];
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}
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const uint8_t *dht_get_friend_public_key(const DHT *dht, uint32_t friend_num)
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{
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assert(friend_num < dht->num_friends);
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return dht->friends_list[friend_num].public_key;
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}
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non_null()
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static bool assoc_timeout(uint64_t cur_time, const IPPTsPng *assoc)
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{
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return (assoc->timestamp + BAD_NODE_TIMEOUT) <= cur_time;
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}
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/** Converts an IPv4-in-IPv6 to IPv4 and returns the new IP_Port.
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*
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* If the ip_port is already IPv4 this function returns a copy of the original ip_port.
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*/
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non_null()
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static IP_Port ip_port_normalize(const IP_Port *ip_port)
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{
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IP_Port res = *ip_port;
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if (net_family_is_ipv6(res.ip.family) && ipv6_ipv4_in_v6(&res.ip.ip.v6)) {
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res.ip.family = net_family_ipv4;
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res.ip.ip.v4.uint32 = res.ip.ip.v6.uint32[3];
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}
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return res;
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}
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/** Compares pk1 and pk2 with pk.
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*
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* return 0 if both are same distance.
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* return 1 if pk1 is closer.
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* return 2 if pk2 is closer.
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*/
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int id_closest(const uint8_t *pk, const uint8_t *pk1, const uint8_t *pk2)
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{
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for (size_t i = 0; i < CRYPTO_PUBLIC_KEY_SIZE; ++i) {
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const uint8_t distance1 = pk[i] ^ pk1[i];
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const uint8_t distance2 = pk[i] ^ pk2[i];
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if (distance1 < distance2) {
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return 1;
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}
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if (distance1 > distance2) {
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return 2;
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}
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}
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return 0;
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}
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/** Return index of first unequal bit number.
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*/
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non_null()
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static unsigned int bit_by_bit_cmp(const uint8_t *pk1, const uint8_t *pk2)
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{
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unsigned int i;
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unsigned int j = 0;
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for (i = 0; i < CRYPTO_PUBLIC_KEY_SIZE; ++i) {
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if (pk1[i] == pk2[i]) {
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continue;
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}
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for (j = 0; j < 8; ++j) {
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const uint8_t mask = 1 << (7 - j);
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if ((pk1[i] & mask) != (pk2[i] & mask)) {
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break;
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}
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}
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break;
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}
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return i * 8 + j;
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}
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/** Shared key generations are costly, it is therefore smart to store commonly used
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* ones so that they can be re-used later without being computed again.
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*
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* If a shared key is already in shared_keys, copy it to shared_key.
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* Otherwise generate it into shared_key and copy it to shared_keys
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*/
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void get_shared_key(const Mono_Time *mono_time, Shared_Keys *shared_keys, uint8_t *shared_key,
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const uint8_t *secret_key, const uint8_t *public_key)
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{
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uint32_t num = -1;
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uint32_t curr = 0;
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for (uint32_t i = 0; i < MAX_KEYS_PER_SLOT; ++i) {
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const int index = public_key[30] * MAX_KEYS_PER_SLOT + i;
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Shared_Key *const key = &shared_keys->keys[index];
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if (key->stored) {
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if (id_equal(public_key, key->public_key)) {
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memcpy(shared_key, key->shared_key, CRYPTO_SHARED_KEY_SIZE);
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++key->times_requested;
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key->time_last_requested = mono_time_get(mono_time);
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return;
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}
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if (num != 0) {
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if (mono_time_is_timeout(mono_time, key->time_last_requested, KEYS_TIMEOUT)) {
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num = 0;
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curr = index;
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} else if (num > key->times_requested) {
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num = key->times_requested;
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curr = index;
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}
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}
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} else if (num != 0) {
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num = 0;
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curr = index;
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}
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}
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encrypt_precompute(public_key, secret_key, shared_key);
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if (num != UINT32_MAX) {
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Shared_Key *const key = &shared_keys->keys[curr];
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key->stored = true;
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key->times_requested = 1;
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memcpy(key->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
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memcpy(key->shared_key, shared_key, CRYPTO_SHARED_KEY_SIZE);
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key->time_last_requested = mono_time_get(mono_time);
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}
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}
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/** Copy shared_key to encrypt/decrypt DHT packet from public_key into shared_key
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* for packets that we receive.
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*/
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void dht_get_shared_key_recv(DHT *dht, uint8_t *shared_key, const uint8_t *public_key)
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{
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get_shared_key(dht->mono_time, &dht->shared_keys_recv, shared_key, dht->self_secret_key, public_key);
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}
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/** Copy shared_key to encrypt/decrypt DHT packet from public_key into shared_key
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* for packets that we send.
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*/
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void dht_get_shared_key_sent(DHT *dht, uint8_t *shared_key, const uint8_t *public_key)
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{
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get_shared_key(dht->mono_time, &dht->shared_keys_sent, shared_key, dht->self_secret_key, public_key);
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}
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#define CRYPTO_SIZE (1 + CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE)
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/** Create a request to peer.
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* send_public_key and send_secret_key are the pub/secret keys of the sender.
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* recv_public_key is public key of receiver.
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* packet must be an array of MAX_CRYPTO_REQUEST_SIZE big.
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* Data represents the data we send with the request with length being the length of the data.
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* request_id is the id of the request (32 = friend request, 254 = ping request).
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*
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* return -1 on failure.
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* return the length of the created packet on success.
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*/
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int create_request(const uint8_t *send_public_key, const uint8_t *send_secret_key, uint8_t *packet,
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const uint8_t *recv_public_key, const uint8_t *data, uint32_t length, uint8_t request_id)
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{
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if (!send_public_key || !packet || !recv_public_key || !data) {
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return -1;
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}
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if (MAX_CRYPTO_REQUEST_SIZE < length + CRYPTO_SIZE + 1 + CRYPTO_MAC_SIZE) {
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return -1;
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}
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uint8_t *const nonce = packet + 1 + CRYPTO_PUBLIC_KEY_SIZE * 2;
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random_nonce(nonce);
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uint8_t temp[MAX_CRYPTO_REQUEST_SIZE];
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memcpy(temp + 1, data, length);
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temp[0] = request_id;
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const int len = encrypt_data(recv_public_key, send_secret_key, nonce, temp, length + 1,
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CRYPTO_SIZE + packet);
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if (len == -1) {
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crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
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return -1;
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}
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packet[0] = NET_PACKET_CRYPTO;
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memcpy(packet + 1, recv_public_key, CRYPTO_PUBLIC_KEY_SIZE);
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memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, send_public_key, CRYPTO_PUBLIC_KEY_SIZE);
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crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
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return len + CRYPTO_SIZE;
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}
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/** Puts the senders public key in the request in public_key, the data from the request
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* in data if a friend or ping request was sent to us and returns the length of the data.
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* packet is the request packet and length is its length.
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*
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* return -1 if not valid request.
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*/
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int handle_request(const uint8_t *self_public_key, const uint8_t *self_secret_key, uint8_t *public_key, uint8_t *data,
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uint8_t *request_id, const uint8_t *packet, uint16_t length)
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{
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if (!self_public_key || !public_key || !data || !request_id || !packet) {
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return -1;
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}
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if (length <= CRYPTO_SIZE + CRYPTO_MAC_SIZE || length > MAX_CRYPTO_REQUEST_SIZE) {
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return -1;
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}
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if (!id_equal(packet + 1, self_public_key)) {
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return -1;
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}
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memcpy(public_key, packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, CRYPTO_PUBLIC_KEY_SIZE);
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const uint8_t *const nonce = packet + 1 + CRYPTO_PUBLIC_KEY_SIZE * 2;
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uint8_t temp[MAX_CRYPTO_REQUEST_SIZE];
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int len1 = decrypt_data(public_key, self_secret_key, nonce,
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packet + CRYPTO_SIZE, length - CRYPTO_SIZE, temp);
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if (len1 == -1 || len1 == 0) {
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crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
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return -1;
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}
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request_id[0] = temp[0];
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--len1;
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memcpy(data, temp + 1, len1);
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crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
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return len1;
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}
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#define PACKED_NODE_SIZE_IP4 (1 + SIZE_IP4 + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE)
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#define PACKED_NODE_SIZE_IP6 (1 + SIZE_IP6 + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE)
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/** Return packet size of packed node with ip_family on success.
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* Return -1 on failure.
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*/
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int packed_node_size(Family ip_family)
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{
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if (net_family_is_ipv4(ip_family) || net_family_is_tcp_ipv4(ip_family)) {
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return PACKED_NODE_SIZE_IP4;
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}
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if (net_family_is_ipv6(ip_family) || net_family_is_tcp_ipv6(ip_family)) {
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return PACKED_NODE_SIZE_IP6;
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}
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return -1;
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}
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/** Packs an IP_Port structure into data of max size length.
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*
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* Packed_length is the offset of data currently packed.
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*
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* Returns size of packed IP_Port data on success
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* Return -1 on failure.
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*/
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int pack_ip_port(uint8_t *data, uint16_t length, const IP_Port *ip_port)
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{
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if (data == nullptr) {
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return -1;
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}
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bool is_ipv4;
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uint8_t net_family;
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if (net_family_is_ipv4(ip_port->ip.family)) {
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// TODO(irungentoo): use functions to convert endianness
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is_ipv4 = true;
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net_family = TOX_AF_INET;
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} else if (net_family_is_tcp_ipv4(ip_port->ip.family)) {
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is_ipv4 = true;
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net_family = TOX_TCP_INET;
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} else if (net_family_is_ipv6(ip_port->ip.family)) {
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is_ipv4 = false;
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net_family = TOX_AF_INET6;
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} else if (net_family_is_tcp_ipv6(ip_port->ip.family)) {
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is_ipv4 = false;
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net_family = TOX_TCP_INET6;
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} else {
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return -1;
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}
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if (is_ipv4) {
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const uint32_t size = 1 + SIZE_IP4 + sizeof(uint16_t);
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if (size > length) {
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return -1;
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}
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data[0] = net_family;
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memcpy(data + 1, &ip_port->ip.ip.v4, SIZE_IP4);
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memcpy(data + 1 + SIZE_IP4, &ip_port->port, sizeof(uint16_t));
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return size;
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} else {
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const uint32_t size = 1 + SIZE_IP6 + sizeof(uint16_t);
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if (size > length) {
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return -1;
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}
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data[0] = net_family;
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memcpy(data + 1, &ip_port->ip.ip.v6, SIZE_IP6);
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memcpy(data + 1 + SIZE_IP6, &ip_port->port, sizeof(uint16_t));
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return size;
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}
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}
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non_null()
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static int dht_create_packet(const uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE],
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const uint8_t *shared_key, const uint8_t type,
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const uint8_t *plain, size_t plain_length, uint8_t *packet)
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{
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VLA(uint8_t, encrypted, plain_length + CRYPTO_MAC_SIZE);
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uint8_t nonce[CRYPTO_NONCE_SIZE];
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random_nonce(nonce);
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const int encrypted_length = encrypt_data_symmetric(shared_key, nonce, plain, plain_length, encrypted);
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|
|
|
if (encrypted_length == -1) {
|
|
return -1;
|
|
}
|
|
|
|
packet[0] = type;
|
|
memcpy(packet + 1, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, nonce, CRYPTO_NONCE_SIZE);
|
|
memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE, encrypted, encrypted_length);
|
|
|
|
return 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + encrypted_length;
|
|
}
|
|
|
|
/** Unpack IP_Port structure from data of max size length into ip_port.
|
|
*
|
|
* len_processed is the offset of data currently unpacked.
|
|
*
|
|
* Return size of unpacked ip_port on success.
|
|
* Return -1 on failure.
|
|
*/
|
|
int unpack_ip_port(IP_Port *ip_port, const uint8_t *data, uint16_t length, bool tcp_enabled)
|
|
{
|
|
if (data == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
bool is_ipv4;
|
|
Family host_family;
|
|
|
|
if (data[0] == TOX_AF_INET) {
|
|
is_ipv4 = true;
|
|
host_family = net_family_ipv4;
|
|
} else if (data[0] == TOX_TCP_INET) {
|
|
if (!tcp_enabled) {
|
|
return -1;
|
|
}
|
|
|
|
is_ipv4 = true;
|
|
host_family = net_family_tcp_ipv4;
|
|
} else if (data[0] == TOX_AF_INET6) {
|
|
is_ipv4 = false;
|
|
host_family = net_family_ipv6;
|
|
} else if (data[0] == TOX_TCP_INET6) {
|
|
if (!tcp_enabled) {
|
|
return -1;
|
|
}
|
|
|
|
is_ipv4 = false;
|
|
host_family = net_family_tcp_ipv6;
|
|
} else {
|
|
return -1;
|
|
}
|
|
|
|
*ip_port = (IP_Port) {
|
|
0
|
|
};
|
|
|
|
if (is_ipv4) {
|
|
const uint32_t size = 1 + SIZE_IP4 + sizeof(uint16_t);
|
|
|
|
if (size > length) {
|
|
return -1;
|
|
}
|
|
|
|
ip_port->ip.family = host_family;
|
|
memcpy(&ip_port->ip.ip.v4, data + 1, SIZE_IP4);
|
|
memcpy(&ip_port->port, data + 1 + SIZE_IP4, sizeof(uint16_t));
|
|
return size;
|
|
} else {
|
|
const uint32_t size = 1 + SIZE_IP6 + sizeof(uint16_t);
|
|
|
|
if (size > length) {
|
|
return -1;
|
|
}
|
|
|
|
ip_port->ip.family = host_family;
|
|
memcpy(&ip_port->ip.ip.v6, data + 1, SIZE_IP6);
|
|
memcpy(&ip_port->port, data + 1 + SIZE_IP6, sizeof(uint16_t));
|
|
return size;
|
|
}
|
|
}
|
|
|
|
/** Pack number of nodes into data of maxlength length.
|
|
*
|
|
* return length of packed nodes on success.
|
|
* return -1 on failure.
|
|
*/
|
|
int pack_nodes(uint8_t *data, uint16_t length, const Node_format *nodes, uint16_t number)
|
|
{
|
|
uint32_t packed_length = 0;
|
|
|
|
for (uint32_t i = 0; i < number && packed_length < length; ++i) {
|
|
const int ipp_size = pack_ip_port(data + packed_length, length - packed_length, &nodes[i].ip_port);
|
|
|
|
if (ipp_size == -1) {
|
|
return -1;
|
|
}
|
|
|
|
packed_length += ipp_size;
|
|
|
|
if (packed_length + CRYPTO_PUBLIC_KEY_SIZE > length) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(data + packed_length, nodes[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
packed_length += CRYPTO_PUBLIC_KEY_SIZE;
|
|
|
|
#ifndef NDEBUG
|
|
const uint32_t increment = ipp_size + CRYPTO_PUBLIC_KEY_SIZE;
|
|
#endif
|
|
assert(increment == PACKED_NODE_SIZE_IP4 || increment == PACKED_NODE_SIZE_IP6);
|
|
}
|
|
|
|
return packed_length;
|
|
}
|
|
|
|
/** Unpack data of length into nodes of size max_num_nodes.
|
|
* Put the length of the data processed in processed_data_len.
|
|
* tcp_enabled sets if TCP nodes are expected (true) or not (false).
|
|
*
|
|
* return number of unpacked nodes on success.
|
|
* return -1 on failure.
|
|
*/
|
|
int unpack_nodes(Node_format *nodes, uint16_t max_num_nodes, uint16_t *processed_data_len, const uint8_t *data,
|
|
uint16_t length, bool tcp_enabled)
|
|
{
|
|
uint32_t num = 0;
|
|
uint32_t len_processed = 0;
|
|
|
|
while (num < max_num_nodes && len_processed < length) {
|
|
const int ipp_size = unpack_ip_port(&nodes[num].ip_port, data + len_processed, length - len_processed, tcp_enabled);
|
|
|
|
if (ipp_size == -1) {
|
|
return -1;
|
|
}
|
|
|
|
len_processed += ipp_size;
|
|
|
|
if (len_processed + CRYPTO_PUBLIC_KEY_SIZE > length) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(nodes[num].public_key, data + len_processed, CRYPTO_PUBLIC_KEY_SIZE);
|
|
len_processed += CRYPTO_PUBLIC_KEY_SIZE;
|
|
++num;
|
|
|
|
#ifndef NDEBUG
|
|
const uint32_t increment = ipp_size + CRYPTO_PUBLIC_KEY_SIZE;
|
|
#endif
|
|
assert(increment == PACKED_NODE_SIZE_IP4 || increment == PACKED_NODE_SIZE_IP6);
|
|
}
|
|
|
|
if (processed_data_len) {
|
|
*processed_data_len = len_processed;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
/** Find index in an array with public_key equal to pk.
|
|
*
|
|
* return index or UINT32_MAX if not found.
|
|
*/
|
|
non_null(3) nullable(1)
|
|
static uint32_t index_of_client_pk(const Client_data *array, uint32_t size, const uint8_t *pk)
|
|
{
|
|
assert(size == 0 || array != nullptr);
|
|
|
|
for (uint32_t i = 0; i < size; ++i) {
|
|
if (id_equal(array[i].public_key, pk)) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return UINT32_MAX;
|
|
}
|
|
|
|
non_null(3) nullable(1)
|
|
static uint32_t index_of_friend_pk(const DHT_Friend *array, uint32_t size, const uint8_t *pk)
|
|
{
|
|
assert(size == 0 || array != nullptr);
|
|
|
|
for (uint32_t i = 0; i < size; ++i) {
|
|
if (id_equal(array[i].public_key, pk)) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return UINT32_MAX;
|
|
}
|
|
|
|
non_null(3) nullable(1)
|
|
static uint32_t index_of_node_pk(const Node_format *array, uint32_t size, const uint8_t *pk)
|
|
{
|
|
assert(size == 0 || array != nullptr);
|
|
|
|
for (uint32_t i = 0; i < size; ++i) {
|
|
if (id_equal(array[i].public_key, pk)) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return UINT32_MAX;
|
|
}
|
|
|
|
/** Find index of Client_data with ip_port equal to param ip_port.
|
|
*
|
|
* return index or UINT32_MAX if not found.
|
|
*/
|
|
non_null(3) nullable(1)
|
|
static uint32_t index_of_client_ip_port(const Client_data *array, uint32_t size, const IP_Port *ip_port)
|
|
{
|
|
assert(size == 0 || array != nullptr);
|
|
|
|
for (uint32_t i = 0; i < size; ++i) {
|
|
if ((net_family_is_ipv4(ip_port->ip.family) && ipport_equal(&array[i].assoc4.ip_port, ip_port)) ||
|
|
(net_family_is_ipv6(ip_port->ip.family) && ipport_equal(&array[i].assoc6.ip_port, ip_port))) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return UINT32_MAX;
|
|
}
|
|
|
|
/** Update ip_port of client if it's needed.
|
|
*/
|
|
non_null()
|
|
static void update_client(const Logger *log, const Mono_Time *mono_time, int index, Client_data *client,
|
|
const IP_Port *ip_port)
|
|
{
|
|
IPPTsPng *assoc;
|
|
int ip_version;
|
|
|
|
if (net_family_is_ipv4(ip_port->ip.family)) {
|
|
assoc = &client->assoc4;
|
|
ip_version = 4;
|
|
} else if (net_family_is_ipv6(ip_port->ip.family)) {
|
|
assoc = &client->assoc6;
|
|
ip_version = 6;
|
|
} else {
|
|
return;
|
|
}
|
|
|
|
if (!ipport_equal(&assoc->ip_port, ip_port)) {
|
|
char ip_str[IP_NTOA_LEN];
|
|
LOGGER_TRACE(log, "coipil[%u]: switching ipv%d from %s:%u to %s:%u",
|
|
index, ip_version,
|
|
ip_ntoa(&assoc->ip_port.ip, ip_str, sizeof(ip_str)),
|
|
net_ntohs(assoc->ip_port.port),
|
|
ip_ntoa(&ip_port->ip, ip_str, sizeof(ip_str)),
|
|
net_ntohs(ip_port->port));
|
|
}
|
|
|
|
if (!ip_is_lan(&assoc->ip_port.ip) && ip_is_lan(&ip_port->ip)) {
|
|
return;
|
|
}
|
|
|
|
assoc->ip_port = *ip_port;
|
|
assoc->timestamp = mono_time_get(mono_time);
|
|
}
|
|
|
|
/** Check if client with public_key is already in list of length length.
|
|
* If it is then set its corresponding timestamp to current time.
|
|
* If the id is already in the list with a different ip_port, update it.
|
|
* TODO(irungentoo): Maybe optimize this.
|
|
*
|
|
* return True(1) or False(0)
|
|
*/
|
|
non_null()
|
|
static int client_or_ip_port_in_list(const Logger *log, const Mono_Time *mono_time, Client_data *list, uint16_t length,
|
|
const uint8_t *public_key, const IP_Port *ip_port)
|
|
{
|
|
const uint64_t temp_time = mono_time_get(mono_time);
|
|
uint32_t index = index_of_client_pk(list, length, public_key);
|
|
|
|
/* if public_key is in list, find it and maybe overwrite ip_port */
|
|
if (index != UINT32_MAX) {
|
|
update_client(log, mono_time, index, &list[index], ip_port);
|
|
return 1;
|
|
}
|
|
|
|
/* public_key not in list yet: see if we can find an identical ip_port, in
|
|
* that case we kill the old public_key by overwriting it with the new one
|
|
* TODO(irungentoo): maybe we SHOULDN'T do that if that public_key is in a friend_list
|
|
* and the one who is the actual friend's public_key/address set?
|
|
* MAYBE: check the other address, if valid, don't nuke? */
|
|
index = index_of_client_ip_port(list, length, ip_port);
|
|
|
|
if (index == UINT32_MAX) {
|
|
return 0;
|
|
}
|
|
|
|
IPPTsPng *assoc;
|
|
int ip_version;
|
|
|
|
if (net_family_is_ipv4(ip_port->ip.family)) {
|
|
assoc = &list[index].assoc4;
|
|
ip_version = 4;
|
|
} else {
|
|
assoc = &list[index].assoc6;
|
|
ip_version = 6;
|
|
}
|
|
|
|
/* Initialize client timestamp. */
|
|
assoc->timestamp = temp_time;
|
|
memcpy(list[index].public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
|
|
LOGGER_DEBUG(log, "coipil[%u]: switching public_key (ipv%d)", index, ip_version);
|
|
|
|
/* kill the other address, if it was set */
|
|
*assoc = (IPPTsPng) {
|
|
0
|
|
};
|
|
return 1;
|
|
}
|
|
|
|
bool add_to_list(Node_format *nodes_list, uint32_t length, const uint8_t *pk, const IP_Port *ip_port,
|
|
const uint8_t *cmp_pk)
|
|
{
|
|
for (uint32_t i = 0; i < length; ++i) {
|
|
if (id_closest(cmp_pk, nodes_list[i].public_key, pk) == 2) {
|
|
uint8_t pk_bak[CRYPTO_PUBLIC_KEY_SIZE];
|
|
memcpy(pk_bak, nodes_list[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
const IP_Port ip_port_bak = nodes_list[i].ip_port;
|
|
memcpy(nodes_list[i].public_key, pk, CRYPTO_PUBLIC_KEY_SIZE);
|
|
nodes_list[i].ip_port = *ip_port;
|
|
|
|
if (i != length - 1) {
|
|
add_to_list(nodes_list, length, pk_bak, &ip_port_bak, cmp_pk);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* helper for get_close_nodes(). argument list is a monster :D
|
|
*/
|
|
non_null()
|
|
static void get_close_nodes_inner(uint64_t cur_time, const uint8_t *public_key, Node_format *nodes_list,
|
|
Family sa_family, const Client_data *client_list, uint32_t client_list_length,
|
|
uint32_t *num_nodes_ptr, bool is_LAN)
|
|
{
|
|
if (!net_family_is_ipv4(sa_family) && !net_family_is_ipv6(sa_family) && !net_family_is_unspec(sa_family)) {
|
|
return;
|
|
}
|
|
|
|
uint32_t num_nodes = *num_nodes_ptr;
|
|
|
|
for (uint32_t i = 0; i < client_list_length; ++i) {
|
|
const Client_data *const client = &client_list[i];
|
|
|
|
/* node already in list? */
|
|
if (index_of_node_pk(nodes_list, MAX_SENT_NODES, client->public_key) != UINT32_MAX) {
|
|
continue;
|
|
}
|
|
|
|
const IPPTsPng *ipptp;
|
|
|
|
if (net_family_is_ipv4(sa_family)) {
|
|
ipptp = &client->assoc4;
|
|
} else if (net_family_is_ipv6(sa_family)) {
|
|
ipptp = &client->assoc6;
|
|
} else if (client->assoc4.timestamp >= client->assoc6.timestamp) {
|
|
ipptp = &client->assoc4;
|
|
} else {
|
|
ipptp = &client->assoc6;
|
|
}
|
|
|
|
/* node not in a good condition? */
|
|
if (assoc_timeout(cur_time, ipptp)) {
|
|
continue;
|
|
}
|
|
|
|
/* don't send LAN ips to non LAN peers */
|
|
if (ip_is_lan(&ipptp->ip_port.ip) && !is_LAN) {
|
|
continue;
|
|
}
|
|
|
|
if (num_nodes < MAX_SENT_NODES) {
|
|
memcpy(nodes_list[num_nodes].public_key, client->public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
nodes_list[num_nodes].ip_port = ipptp->ip_port;
|
|
++num_nodes;
|
|
} else {
|
|
add_to_list(nodes_list, MAX_SENT_NODES, client->public_key, &ipptp->ip_port, public_key);
|
|
}
|
|
}
|
|
|
|
*num_nodes_ptr = num_nodes;
|
|
}
|
|
|
|
/** Find MAX_SENT_NODES nodes closest to the public_key for the send nodes request:
|
|
* put them in the nodes_list and return how many were found.
|
|
*
|
|
* TODO(irungentoo): For the love of based <your favorite deity, in doubt use
|
|
* "love"> make this function cleaner and much more efficient.
|
|
*/
|
|
non_null()
|
|
static int get_somewhat_close_nodes(const DHT *dht, const uint8_t *public_key, Node_format *nodes_list,
|
|
Family sa_family, bool is_LAN)
|
|
{
|
|
uint32_t num_nodes = 0;
|
|
get_close_nodes_inner(dht->cur_time, public_key, nodes_list, sa_family,
|
|
dht->close_clientlist, LCLIENT_LIST, &num_nodes, is_LAN);
|
|
|
|
for (uint32_t i = 0; i < dht->num_friends; ++i) {
|
|
get_close_nodes_inner(dht->cur_time, public_key, nodes_list, sa_family,
|
|
dht->friends_list[i].client_list, MAX_FRIEND_CLIENTS,
|
|
&num_nodes, is_LAN);
|
|
}
|
|
|
|
return num_nodes;
|
|
}
|
|
|
|
int get_close_nodes(const DHT *dht, const uint8_t *public_key, Node_format *nodes_list, Family sa_family,
|
|
bool is_LAN)
|
|
{
|
|
memset(nodes_list, 0, MAX_SENT_NODES * sizeof(Node_format));
|
|
return get_somewhat_close_nodes(dht, public_key, nodes_list, sa_family, is_LAN);
|
|
}
|
|
|
|
typedef struct DHT_Cmp_Data {
|
|
uint64_t cur_time;
|
|
const uint8_t *base_public_key;
|
|
Client_data entry;
|
|
} DHT_Cmp_Data;
|
|
|
|
non_null()
|
|
static int dht_cmp_entry(const void *a, const void *b)
|
|
{
|
|
const DHT_Cmp_Data *cmp1 = (const DHT_Cmp_Data *)a;
|
|
const DHT_Cmp_Data *cmp2 = (const DHT_Cmp_Data *)b;
|
|
const Client_data entry1 = cmp1->entry;
|
|
const Client_data entry2 = cmp2->entry;
|
|
const uint8_t *cmp_public_key = cmp1->base_public_key;
|
|
|
|
const bool t1 = assoc_timeout(cmp1->cur_time, &entry1.assoc4) && assoc_timeout(cmp1->cur_time, &entry1.assoc6);
|
|
const bool t2 = assoc_timeout(cmp2->cur_time, &entry2.assoc4) && assoc_timeout(cmp2->cur_time, &entry2.assoc6);
|
|
|
|
if (t1 && t2) {
|
|
return 0;
|
|
}
|
|
|
|
if (t1) {
|
|
return -1;
|
|
}
|
|
|
|
if (t2) {
|
|
return 1;
|
|
}
|
|
|
|
const int close = id_closest(cmp_public_key, entry1.public_key, entry2.public_key);
|
|
|
|
if (close == 1) {
|
|
return 1;
|
|
}
|
|
|
|
if (close == 2) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Is it ok to store node with public_key in client.
|
|
*
|
|
* return 0 if node can't be stored.
|
|
* return 1 if it can.
|
|
*/
|
|
non_null()
|
|
static unsigned int store_node_ok(const Client_data *client, uint64_t cur_time, const uint8_t *public_key,
|
|
const uint8_t *comp_public_key)
|
|
{
|
|
return (assoc_timeout(cur_time, &client->assoc4)
|
|
&& assoc_timeout(cur_time, &client->assoc6))
|
|
|| id_closest(comp_public_key, client->public_key, public_key) == 2;
|
|
}
|
|
|
|
non_null()
|
|
static void sort_client_list(Client_data *list, uint64_t cur_time, unsigned int length,
|
|
const uint8_t *comp_public_key)
|
|
{
|
|
// Pass comp_public_key to qsort with each Client_data entry, so the
|
|
// comparison function can use it as the base of comparison.
|
|
VLA(DHT_Cmp_Data, cmp_list, length);
|
|
|
|
for (uint32_t i = 0; i < length; ++i) {
|
|
cmp_list[i].cur_time = cur_time;
|
|
cmp_list[i].base_public_key = comp_public_key;
|
|
cmp_list[i].entry = list[i];
|
|
}
|
|
|
|
qsort(cmp_list, length, sizeof(DHT_Cmp_Data), dht_cmp_entry);
|
|
|
|
for (uint32_t i = 0; i < length; ++i) {
|
|
list[i] = cmp_list[i].entry;
|
|
}
|
|
}
|
|
|
|
non_null()
|
|
static void update_client_with_reset(const Mono_Time *mono_time, Client_data *client, const IP_Port *ip_port)
|
|
{
|
|
IPPTsPng *ipptp_write = nullptr;
|
|
IPPTsPng *ipptp_clear = nullptr;
|
|
|
|
if (net_family_is_ipv4(ip_port->ip.family)) {
|
|
ipptp_write = &client->assoc4;
|
|
ipptp_clear = &client->assoc6;
|
|
} else {
|
|
ipptp_write = &client->assoc6;
|
|
ipptp_clear = &client->assoc4;
|
|
}
|
|
|
|
ipptp_write->ip_port = *ip_port;
|
|
ipptp_write->timestamp = mono_time_get(mono_time);
|
|
|
|
ip_reset(&ipptp_write->ret_ip_port.ip);
|
|
ipptp_write->ret_ip_port.port = 0;
|
|
ipptp_write->ret_timestamp = 0;
|
|
ipptp_write->ret_ip_self = false;
|
|
|
|
/* zero out other address */
|
|
memset(ipptp_clear, 0, sizeof(*ipptp_clear));
|
|
}
|
|
|
|
/** Replace a first bad (or empty) node with this one
|
|
* or replace a possibly bad node (tests failed or not done yet)
|
|
* that is further than any other in the list
|
|
* from the comp_public_key
|
|
* or replace a good node that is further
|
|
* than any other in the list from the comp_public_key
|
|
* and further than public_key.
|
|
*
|
|
* Do not replace any node if the list has no bad or possibly bad nodes
|
|
* and all nodes in the list are closer to comp_public_key
|
|
* than public_key.
|
|
*
|
|
* returns true when the item was stored, false otherwise */
|
|
non_null()
|
|
static bool replace_all(const DHT *dht,
|
|
Client_data *list,
|
|
uint16_t length,
|
|
const uint8_t *public_key,
|
|
const IP_Port *ip_port,
|
|
const uint8_t *comp_public_key)
|
|
{
|
|
if (!net_family_is_ipv4(ip_port->ip.family) && !net_family_is_ipv6(ip_port->ip.family)) {
|
|
return false;
|
|
}
|
|
|
|
if (!store_node_ok(&list[1], dht->cur_time, public_key, comp_public_key) &&
|
|
!store_node_ok(&list[0], dht->cur_time, public_key, comp_public_key)) {
|
|
return false;
|
|
}
|
|
|
|
sort_client_list(list, dht->cur_time, length, comp_public_key);
|
|
|
|
Client_data *const client = &list[0];
|
|
id_copy(client->public_key, public_key);
|
|
|
|
update_client_with_reset(dht->mono_time, client, ip_port);
|
|
return true;
|
|
}
|
|
|
|
/** Add node to close list.
|
|
*
|
|
* simulate is set to 1 if we want to check if a node can be added to the list without adding it.
|
|
*
|
|
* return -1 on failure.
|
|
* return 0 on success.
|
|
*/
|
|
non_null()
|
|
static int add_to_close(DHT *dht, const uint8_t *public_key, const IP_Port *ip_port, bool simulate)
|
|
{
|
|
unsigned int index = bit_by_bit_cmp(public_key, dht->self_public_key);
|
|
|
|
if (index >= LCLIENT_LENGTH) {
|
|
index = LCLIENT_LENGTH - 1;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < LCLIENT_NODES; ++i) {
|
|
/* TODO(iphydf): write bounds checking test to catch the case that
|
|
* index is left as >= LCLIENT_LENGTH */
|
|
Client_data *const client = &dht->close_clientlist[(index * LCLIENT_NODES) + i];
|
|
|
|
if (!assoc_timeout(dht->cur_time, &client->assoc4) ||
|
|
!assoc_timeout(dht->cur_time, &client->assoc6)) {
|
|
continue;
|
|
}
|
|
|
|
if (simulate) {
|
|
return 0;
|
|
}
|
|
|
|
id_copy(client->public_key, public_key);
|
|
update_client_with_reset(dht->mono_time, client, ip_port);
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** Return 1 if node can be added to close list, 0 if it can't.
|
|
*/
|
|
bool node_addable_to_close_list(DHT *dht, const uint8_t *public_key, const IP_Port *ip_port)
|
|
{
|
|
return add_to_close(dht, public_key, ip_port, 1) == 0;
|
|
}
|
|
|
|
non_null()
|
|
static bool is_pk_in_client_list(const Client_data *list, unsigned int client_list_length, uint64_t cur_time,
|
|
const uint8_t *public_key, const IP_Port *ip_port)
|
|
{
|
|
const uint32_t index = index_of_client_pk(list, client_list_length, public_key);
|
|
|
|
if (index == UINT32_MAX) {
|
|
return 0;
|
|
}
|
|
|
|
const IPPTsPng *assoc = net_family_is_ipv4(ip_port->ip.family)
|
|
? &list[index].assoc4
|
|
: &list[index].assoc6;
|
|
|
|
return !assoc_timeout(cur_time, assoc);
|
|
}
|
|
|
|
non_null()
|
|
static bool is_pk_in_close_list(const DHT *dht, const uint8_t *public_key, const IP_Port *ip_port)
|
|
{
|
|
unsigned int index = bit_by_bit_cmp(public_key, dht->self_public_key);
|
|
|
|
if (index >= LCLIENT_LENGTH) {
|
|
index = LCLIENT_LENGTH - 1;
|
|
}
|
|
|
|
return is_pk_in_client_list(dht->close_clientlist + index * LCLIENT_NODES, LCLIENT_NODES, dht->cur_time, public_key,
|
|
ip_port);
|
|
}
|
|
|
|
/** Check if the node obtained with a get_nodes with public_key should be pinged.
|
|
* NOTE: for best results call it after addto_lists.
|
|
*
|
|
* return false if the node should not be pinged.
|
|
* return true if it should.
|
|
*/
|
|
non_null()
|
|
static bool ping_node_from_getnodes_ok(DHT *dht, const uint8_t *public_key, const IP_Port *ip_port)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (add_to_close(dht, public_key, ip_port, 1) == 0) {
|
|
ret = true;
|
|
}
|
|
|
|
{
|
|
unsigned int *const num = &dht->num_to_bootstrap;
|
|
const uint32_t index = index_of_node_pk(dht->to_bootstrap, *num, public_key);
|
|
const bool in_close_list = is_pk_in_close_list(dht, public_key, ip_port);
|
|
|
|
if (ret && index == UINT32_MAX && !in_close_list) {
|
|
if (*num < MAX_CLOSE_TO_BOOTSTRAP_NODES) {
|
|
memcpy(dht->to_bootstrap[*num].public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
dht->to_bootstrap[*num].ip_port = *ip_port;
|
|
++*num;
|
|
} else {
|
|
// TODO(irungentoo): ipv6 vs v4
|
|
add_to_list(dht->to_bootstrap, MAX_CLOSE_TO_BOOTSTRAP_NODES, public_key, ip_port, dht->self_public_key);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (uint32_t i = 0; i < dht->num_friends; ++i) {
|
|
DHT_Friend *dht_friend = &dht->friends_list[i];
|
|
|
|
bool store_ok = false;
|
|
|
|
if (store_node_ok(&dht_friend->client_list[1], dht->cur_time, public_key, dht_friend->public_key)) {
|
|
store_ok = true;
|
|
}
|
|
|
|
if (store_node_ok(&dht_friend->client_list[0], dht->cur_time, public_key, dht_friend->public_key)) {
|
|
store_ok = true;
|
|
}
|
|
|
|
unsigned int *const friend_num = &dht_friend->num_to_bootstrap;
|
|
const uint32_t index = index_of_node_pk(dht_friend->to_bootstrap, *friend_num, public_key);
|
|
const bool pk_in_list = is_pk_in_client_list(dht_friend->client_list, MAX_FRIEND_CLIENTS, dht->cur_time, public_key,
|
|
ip_port);
|
|
|
|
if (store_ok && index == UINT32_MAX && !pk_in_list) {
|
|
if (*friend_num < MAX_SENT_NODES) {
|
|
Node_format *const format = &dht_friend->to_bootstrap[*friend_num];
|
|
memcpy(format->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
format->ip_port = *ip_port;
|
|
++*friend_num;
|
|
} else {
|
|
add_to_list(dht_friend->to_bootstrap, MAX_SENT_NODES, public_key, ip_port, dht_friend->public_key);
|
|
}
|
|
|
|
ret = true;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/** Attempt to add client with ip_port and public_key to the friends client list
|
|
* and close_clientlist.
|
|
*
|
|
* returns 1+ if the item is used in any list, 0 else
|
|
*/
|
|
uint32_t addto_lists(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key)
|
|
{
|
|
IP_Port ipp_copy = ip_port_normalize(ip_port);
|
|
|
|
uint32_t used = 0;
|
|
|
|
/* NOTE: Current behavior if there are two clients with the same id is
|
|
* to replace the first ip by the second.
|
|
*/
|
|
const bool in_close_list = client_or_ip_port_in_list(dht->log, dht->mono_time, dht->close_clientlist, LCLIENT_LIST,
|
|
public_key, &ipp_copy);
|
|
|
|
/* add_to_close should be called only if !in_list (don't extract to variable) */
|
|
if (in_close_list || add_to_close(dht, public_key, &ipp_copy, 0)) {
|
|
++used;
|
|
}
|
|
|
|
const DHT_Friend *friend_foundip = nullptr;
|
|
|
|
for (uint32_t i = 0; i < dht->num_friends; ++i) {
|
|
const bool in_list = client_or_ip_port_in_list(dht->log, dht->mono_time, dht->friends_list[i].client_list,
|
|
MAX_FRIEND_CLIENTS, public_key, &ipp_copy);
|
|
|
|
/* replace_all should be called only if !in_list (don't extract to variable) */
|
|
if (in_list
|
|
|| replace_all(dht, dht->friends_list[i].client_list, MAX_FRIEND_CLIENTS, public_key, &ipp_copy,
|
|
dht->friends_list[i].public_key)) {
|
|
DHT_Friend *dht_friend = &dht->friends_list[i];
|
|
|
|
if (id_equal(public_key, dht_friend->public_key)) {
|
|
friend_foundip = dht_friend;
|
|
}
|
|
|
|
++used;
|
|
}
|
|
}
|
|
|
|
if (!friend_foundip) {
|
|
return used;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < friend_foundip->lock_count; ++i) {
|
|
if (friend_foundip->callbacks[i].ip_callback) {
|
|
friend_foundip->callbacks[i].ip_callback(friend_foundip->callbacks[i].data,
|
|
friend_foundip->callbacks[i].number, &ipp_copy);
|
|
}
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
non_null()
|
|
static bool update_client_data(const Mono_Time *mono_time, Client_data *array, size_t size, const IP_Port *ip_port,
|
|
const uint8_t *pk, bool node_is_self)
|
|
{
|
|
const uint64_t temp_time = mono_time_get(mono_time);
|
|
const uint32_t index = index_of_client_pk(array, size, pk);
|
|
|
|
if (index == UINT32_MAX) {
|
|
return false;
|
|
}
|
|
|
|
Client_data *const data = &array[index];
|
|
IPPTsPng *assoc;
|
|
|
|
if (net_family_is_ipv4(ip_port->ip.family)) {
|
|
assoc = &data->assoc4;
|
|
} else if (net_family_is_ipv6(ip_port->ip.family)) {
|
|
assoc = &data->assoc6;
|
|
} else {
|
|
return true;
|
|
}
|
|
|
|
assoc->ret_ip_port = *ip_port;
|
|
assoc->ret_timestamp = temp_time;
|
|
assoc->ret_ip_self = node_is_self;
|
|
|
|
return true;
|
|
}
|
|
|
|
/** If public_key is a friend or us, update ret_ip_port
|
|
* nodepublic_key is the id of the node that sent us this info.
|
|
*/
|
|
non_null()
|
|
static void returnedip_ports(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key, const uint8_t *nodepublic_key)
|
|
{
|
|
IP_Port ipp_copy = ip_port_normalize(ip_port);
|
|
|
|
if (id_equal(public_key, dht->self_public_key)) {
|
|
update_client_data(dht->mono_time, dht->close_clientlist, LCLIENT_LIST, &ipp_copy, nodepublic_key, true);
|
|
return;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < dht->num_friends; ++i) {
|
|
if (id_equal(public_key, dht->friends_list[i].public_key)) {
|
|
Client_data *const client_list = dht->friends_list[i].client_list;
|
|
|
|
if (update_client_data(dht->mono_time, client_list, MAX_FRIEND_CLIENTS, &ipp_copy, nodepublic_key, false)) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool dht_getnodes(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key, const uint8_t *client_id)
|
|
{
|
|
/* Check if packet is going to be sent to ourself. */
|
|
if (id_equal(public_key, dht->self_public_key)) {
|
|
return false;
|
|
}
|
|
|
|
uint8_t plain_message[sizeof(Node_format) * 2] = {0};
|
|
|
|
Node_format receiver;
|
|
memcpy(receiver.public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
receiver.ip_port = *ip_port;
|
|
|
|
if (pack_nodes(plain_message, sizeof(plain_message), &receiver, 1) == -1) {
|
|
return false;
|
|
}
|
|
|
|
uint64_t ping_id = 0;
|
|
|
|
ping_id = ping_array_add(dht->dht_ping_array, dht->mono_time, plain_message, sizeof(receiver));
|
|
|
|
if (ping_id == 0) {
|
|
return false;
|
|
}
|
|
|
|
uint8_t plain[CRYPTO_PUBLIC_KEY_SIZE + sizeof(ping_id)];
|
|
uint8_t data[1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + sizeof(plain) + CRYPTO_MAC_SIZE];
|
|
|
|
memcpy(plain, client_id, CRYPTO_PUBLIC_KEY_SIZE);
|
|
memcpy(plain + CRYPTO_PUBLIC_KEY_SIZE, &ping_id, sizeof(ping_id));
|
|
|
|
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
|
|
dht_get_shared_key_sent(dht, shared_key, public_key);
|
|
|
|
const int len = dht_create_packet(dht->self_public_key, shared_key, NET_PACKET_GET_NODES,
|
|
plain, sizeof(plain), data);
|
|
|
|
crypto_memzero(shared_key, sizeof(shared_key));
|
|
|
|
if (len != sizeof(data)) {
|
|
return false;
|
|
}
|
|
|
|
if (sendpacket(dht->net, ip_port, data, len) > 0) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/** Send a send nodes response: message for IPv6 nodes */
|
|
non_null()
|
|
static int sendnodes_ipv6(const DHT *dht, const IP_Port *ip_port, const uint8_t *public_key, const uint8_t *client_id,
|
|
const uint8_t *sendback_data, uint16_t length, const uint8_t *shared_encryption_key)
|
|
{
|
|
/* Check if packet is going to be sent to ourself. */
|
|
if (id_equal(public_key, dht->self_public_key)) {
|
|
return -1;
|
|
}
|
|
|
|
if (length != sizeof(uint64_t)) {
|
|
return -1;
|
|
}
|
|
|
|
const size_t node_format_size = sizeof(Node_format);
|
|
|
|
Node_format nodes_list[MAX_SENT_NODES];
|
|
const uint32_t num_nodes =
|
|
get_close_nodes(dht, client_id, nodes_list, net_family_unspec, ip_is_lan(&ip_port->ip));
|
|
|
|
VLA(uint8_t, plain, 1 + node_format_size * MAX_SENT_NODES + length);
|
|
|
|
int nodes_length = 0;
|
|
|
|
if (num_nodes) {
|
|
nodes_length = pack_nodes(plain + 1, node_format_size * MAX_SENT_NODES, nodes_list, num_nodes);
|
|
|
|
if (nodes_length <= 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
plain[0] = num_nodes;
|
|
memcpy(plain + 1 + nodes_length, sendback_data, length);
|
|
|
|
const uint32_t crypto_size = 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE;
|
|
VLA(uint8_t, data, 1 + nodes_length + length + crypto_size);
|
|
|
|
const int len = dht_create_packet(dht->self_public_key, shared_encryption_key, NET_PACKET_SEND_NODES_IPV6,
|
|
plain, 1 + nodes_length + length, data);
|
|
|
|
if (len != SIZEOF_VLA(data)) {
|
|
return -1;
|
|
}
|
|
|
|
return sendpacket(dht->net, ip_port, data, len);
|
|
}
|
|
|
|
#define CRYPTO_NODE_SIZE (CRYPTO_PUBLIC_KEY_SIZE + sizeof(uint64_t))
|
|
|
|
non_null()
|
|
static int handle_getnodes(void *object, const IP_Port *source, const uint8_t *packet, uint16_t length, void *userdata)
|
|
{
|
|
if (length != (CRYPTO_SIZE + CRYPTO_MAC_SIZE + sizeof(uint64_t))) {
|
|
return true;
|
|
}
|
|
|
|
DHT *const dht = (DHT *)object;
|
|
|
|
/* Check if packet is from ourself. */
|
|
if (id_equal(packet + 1, dht->self_public_key)) {
|
|
return true;
|
|
}
|
|
|
|
uint8_t plain[CRYPTO_NODE_SIZE];
|
|
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
|
|
|
|
dht_get_shared_key_recv(dht, shared_key, packet + 1);
|
|
const int len = decrypt_data_symmetric(
|
|
shared_key,
|
|
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
|
|
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
|
|
CRYPTO_NODE_SIZE + CRYPTO_MAC_SIZE,
|
|
plain);
|
|
|
|
if (len != CRYPTO_NODE_SIZE) {
|
|
crypto_memzero(shared_key, sizeof(shared_key));
|
|
return true;
|
|
}
|
|
|
|
sendnodes_ipv6(dht, source, packet + 1, plain, plain + CRYPTO_PUBLIC_KEY_SIZE, sizeof(uint64_t), shared_key);
|
|
|
|
ping_add(dht->ping, packet + 1, source);
|
|
|
|
crypto_memzero(shared_key, sizeof(shared_key));
|
|
|
|
return false;
|
|
}
|
|
|
|
/** Return true if we sent a getnode packet to the peer associated with the supplied info. */
|
|
non_null()
|
|
static bool sent_getnode_to_node(DHT *dht, const uint8_t *public_key, const IP_Port *node_ip_port, uint64_t ping_id)
|
|
{
|
|
uint8_t data[sizeof(Node_format) * 2];
|
|
|
|
if (ping_array_check(dht->dht_ping_array, dht->mono_time, data, sizeof(data), ping_id) != sizeof(Node_format)) {
|
|
return false;
|
|
}
|
|
|
|
Node_format test;
|
|
|
|
if (unpack_nodes(&test, 1, nullptr, data, sizeof(data), false) != 1) {
|
|
return false;
|
|
}
|
|
|
|
if (!ipport_equal(&test.ip_port, node_ip_port) || !id_equal(test.public_key, public_key)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
non_null()
|
|
static int handle_sendnodes_core(void *object, const IP_Port *source, const uint8_t *packet, uint16_t length,
|
|
Node_format *plain_nodes, uint16_t size_plain_nodes, uint32_t *num_nodes_out)
|
|
{
|
|
DHT *const dht = (DHT *)object;
|
|
const uint32_t cid_size = 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + 1 + sizeof(uint64_t) + CRYPTO_MAC_SIZE;
|
|
|
|
if (length < cid_size) { /* too short */
|
|
return 1;
|
|
}
|
|
|
|
const uint32_t data_size = length - cid_size;
|
|
|
|
if (data_size == 0) {
|
|
return 1;
|
|
}
|
|
|
|
if (data_size > sizeof(Node_format) * MAX_SENT_NODES) { /* invalid length */
|
|
return 1;
|
|
}
|
|
|
|
VLA(uint8_t, plain, 1 + data_size + sizeof(uint64_t));
|
|
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
|
|
dht_get_shared_key_sent(dht, shared_key, packet + 1);
|
|
const int len = decrypt_data_symmetric(
|
|
shared_key,
|
|
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
|
|
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
|
|
1 + data_size + sizeof(uint64_t) + CRYPTO_MAC_SIZE,
|
|
plain);
|
|
|
|
crypto_memzero(shared_key, sizeof(shared_key));
|
|
|
|
if ((unsigned int)len != SIZEOF_VLA(plain)) {
|
|
return 1;
|
|
}
|
|
|
|
if (plain[0] > size_plain_nodes) {
|
|
return 1;
|
|
}
|
|
|
|
uint64_t ping_id;
|
|
memcpy(&ping_id, plain + 1 + data_size, sizeof(ping_id));
|
|
|
|
if (!sent_getnode_to_node(dht, packet + 1, source, ping_id)) {
|
|
return 1;
|
|
}
|
|
|
|
uint16_t length_nodes = 0;
|
|
const int num_nodes = unpack_nodes(plain_nodes, plain[0], &length_nodes, plain + 1, data_size, 0);
|
|
|
|
if (length_nodes != data_size) {
|
|
return 1;
|
|
}
|
|
|
|
if (num_nodes != plain[0]) {
|
|
return 1;
|
|
}
|
|
|
|
if (num_nodes < 0) {
|
|
return 1;
|
|
}
|
|
|
|
/* store the address the *request* was sent to */
|
|
addto_lists(dht, source, packet + 1);
|
|
|
|
*num_nodes_out = num_nodes;
|
|
|
|
return 0;
|
|
}
|
|
|
|
non_null()
|
|
static int handle_sendnodes_ipv6(void *object, const IP_Port *source, const uint8_t *packet, uint16_t length,
|
|
void *userdata)
|
|
{
|
|
DHT *const dht = (DHT *)object;
|
|
Node_format plain_nodes[MAX_SENT_NODES];
|
|
uint32_t num_nodes;
|
|
|
|
if (handle_sendnodes_core(object, source, packet, length, plain_nodes, MAX_SENT_NODES, &num_nodes)) {
|
|
return 1;
|
|
}
|
|
|
|
if (num_nodes == 0) {
|
|
return 0;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < num_nodes; ++i) {
|
|
if (ipport_isset(&plain_nodes[i].ip_port)) {
|
|
ping_node_from_getnodes_ok(dht, plain_nodes[i].public_key, &plain_nodes[i].ip_port);
|
|
returnedip_ports(dht, &plain_nodes[i].ip_port, plain_nodes[i].public_key, packet + 1);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------------*/
|
|
/*------------------------END of packet handling functions--------------------------*/
|
|
|
|
non_null(1) nullable(2, 3, 5)
|
|
static void dht_friend_lock(DHT_Friend *const dht_friend, dht_ip_cb *ip_callback,
|
|
void *data, int32_t number, uint16_t *lock_count)
|
|
{
|
|
const uint16_t lock_num = dht_friend->lock_count;
|
|
++dht_friend->lock_count;
|
|
dht_friend->callbacks[lock_num].ip_callback = ip_callback;
|
|
dht_friend->callbacks[lock_num].data = data;
|
|
dht_friend->callbacks[lock_num].number = number;
|
|
|
|
if (lock_count) {
|
|
*lock_count = lock_num + 1;
|
|
}
|
|
}
|
|
|
|
int dht_addfriend(DHT *dht, const uint8_t *public_key, dht_ip_cb *ip_callback,
|
|
void *data, int32_t number, uint16_t *lock_count)
|
|
{
|
|
const uint32_t friend_num = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
|
|
|
|
if (friend_num != UINT32_MAX) { /* Is friend already in DHT? */
|
|
DHT_Friend *const dht_friend = &dht->friends_list[friend_num];
|
|
|
|
if (dht_friend->lock_count == DHT_FRIEND_MAX_LOCKS) {
|
|
return -1;
|
|
}
|
|
|
|
dht_friend_lock(dht_friend, ip_callback, data, number, lock_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
DHT_Friend *const temp = (DHT_Friend *)realloc(dht->friends_list, sizeof(DHT_Friend) * (dht->num_friends + 1));
|
|
|
|
if (temp == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
dht->friends_list = temp;
|
|
DHT_Friend *const dht_friend = &dht->friends_list[dht->num_friends];
|
|
memset(dht_friend, 0, sizeof(DHT_Friend));
|
|
memcpy(dht_friend->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
|
|
dht_friend->nat.nat_ping_id = random_u64();
|
|
++dht->num_friends;
|
|
|
|
dht_friend_lock(dht_friend, ip_callback, data, number, lock_count);
|
|
|
|
dht_friend->num_to_bootstrap = get_close_nodes(dht, dht_friend->public_key, dht_friend->to_bootstrap, net_family_unspec,
|
|
1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dht_delfriend(DHT *dht, const uint8_t *public_key, uint16_t lock_count)
|
|
{
|
|
const uint32_t friend_num = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
|
|
|
|
if (friend_num == UINT32_MAX) {
|
|
return -1;
|
|
}
|
|
|
|
DHT_Friend *const dht_friend = &dht->friends_list[friend_num];
|
|
--dht_friend->lock_count;
|
|
|
|
if (dht_friend->lock_count && lock_count) { /* DHT friend is still in use.*/
|
|
--lock_count;
|
|
dht_friend->callbacks[lock_count].ip_callback = nullptr;
|
|
dht_friend->callbacks[lock_count].data = nullptr;
|
|
dht_friend->callbacks[lock_count].number = 0;
|
|
return 0;
|
|
}
|
|
|
|
--dht->num_friends;
|
|
|
|
if (dht->num_friends != friend_num) {
|
|
dht->friends_list[friend_num] = dht->friends_list[dht->num_friends];
|
|
}
|
|
|
|
if (dht->num_friends == 0) {
|
|
free(dht->friends_list);
|
|
dht->friends_list = nullptr;
|
|
return 0;
|
|
}
|
|
|
|
DHT_Friend *const temp = (DHT_Friend *)realloc(dht->friends_list, sizeof(DHT_Friend) * dht->num_friends);
|
|
|
|
if (temp == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
dht->friends_list = temp;
|
|
return 0;
|
|
}
|
|
|
|
/* TODO(irungentoo): Optimize this. */
|
|
int dht_getfriendip(const DHT *dht, const uint8_t *public_key, IP_Port *ip_port)
|
|
{
|
|
ip_reset(&ip_port->ip);
|
|
ip_port->port = 0;
|
|
|
|
const uint32_t friend_index = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
|
|
|
|
if (friend_index == UINT32_MAX) {
|
|
return -1;
|
|
}
|
|
|
|
const DHT_Friend *const frnd = &dht->friends_list[friend_index];
|
|
const uint32_t client_index = index_of_client_pk(frnd->client_list, MAX_FRIEND_CLIENTS, public_key);
|
|
|
|
if (client_index == -1) {
|
|
return 0;
|
|
}
|
|
|
|
const Client_data *const client = &frnd->client_list[client_index];
|
|
const IPPTsPng *const assocs[] = { &client->assoc6, &client->assoc4, nullptr };
|
|
|
|
for (const IPPTsPng * const *it = assocs; *it; ++it) {
|
|
const IPPTsPng *const assoc = *it;
|
|
|
|
if (!assoc_timeout(dht->cur_time, assoc)) {
|
|
*ip_port = assoc->ip_port;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** returns number of nodes not in kill-timeout */
|
|
non_null()
|
|
static uint8_t do_ping_and_sendnode_requests(DHT *dht, uint64_t *lastgetnode, const uint8_t *public_key,
|
|
Client_data *list, uint32_t list_count, uint32_t *bootstrap_times, bool sortable)
|
|
{
|
|
uint8_t not_kill = 0;
|
|
const uint64_t temp_time = mono_time_get(dht->mono_time);
|
|
|
|
uint32_t num_nodes = 0;
|
|
VLA(Client_data *, client_list, list_count * 2);
|
|
VLA(IPPTsPng *, assoc_list, list_count * 2);
|
|
unsigned int sort = 0;
|
|
bool sort_ok = false;
|
|
|
|
for (uint32_t i = 0; i < list_count; ++i) {
|
|
/* If node is not dead. */
|
|
Client_data *client = &list[i];
|
|
|
|
IPPTsPng *const assocs[] = { &client->assoc6, &client->assoc4 };
|
|
|
|
for (uint32_t j = 0; j < sizeof(assocs) / sizeof(assocs[0]); ++j) {
|
|
IPPTsPng *const assoc = assocs[j];
|
|
|
|
if (!mono_time_is_timeout(dht->mono_time, assoc->timestamp, KILL_NODE_TIMEOUT)) {
|
|
sort = 0;
|
|
++not_kill;
|
|
|
|
if (mono_time_is_timeout(dht->mono_time, assoc->last_pinged, PING_INTERVAL)) {
|
|
dht_getnodes(dht, &assoc->ip_port, client->public_key, public_key);
|
|
assoc->last_pinged = temp_time;
|
|
}
|
|
|
|
/* If node is good. */
|
|
if (!assoc_timeout(dht->cur_time, assoc)) {
|
|
client_list[num_nodes] = client;
|
|
assoc_list[num_nodes] = assoc;
|
|
++num_nodes;
|
|
}
|
|
} else {
|
|
++sort;
|
|
|
|
/* Timed out should be at beginning, if they are not, sort the list. */
|
|
if (sort > 1 && sort < (((j + 1) * 2) - 1)) {
|
|
sort_ok = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sortable && sort_ok) {
|
|
sort_client_list(list, dht->cur_time, list_count, public_key);
|
|
}
|
|
|
|
if ((num_nodes != 0) && (mono_time_is_timeout(dht->mono_time, *lastgetnode, GET_NODE_INTERVAL)
|
|
|| *bootstrap_times < MAX_BOOTSTRAP_TIMES)) {
|
|
uint32_t rand_node = random_range_u32(num_nodes);
|
|
|
|
if ((num_nodes - 1) != rand_node) {
|
|
rand_node += random_range_u32(num_nodes - (rand_node + 1));
|
|
}
|
|
|
|
dht_getnodes(dht, &assoc_list[rand_node]->ip_port, client_list[rand_node]->public_key, public_key);
|
|
|
|
*lastgetnode = temp_time;
|
|
++*bootstrap_times;
|
|
}
|
|
|
|
return not_kill;
|
|
}
|
|
|
|
/** Ping each client in the "friends" list every PING_INTERVAL seconds. Send a get nodes request
|
|
* every GET_NODE_INTERVAL seconds to a random good node for each "friend" in our "friends" list.
|
|
*/
|
|
non_null()
|
|
static void do_dht_friends(DHT *dht)
|
|
{
|
|
for (size_t i = 0; i < dht->num_friends; ++i) {
|
|
DHT_Friend *const dht_friend = &dht->friends_list[i];
|
|
|
|
for (size_t j = 0; j < dht_friend->num_to_bootstrap; ++j) {
|
|
dht_getnodes(dht, &dht_friend->to_bootstrap[j].ip_port, dht_friend->to_bootstrap[j].public_key, dht_friend->public_key);
|
|
}
|
|
|
|
dht_friend->num_to_bootstrap = 0;
|
|
|
|
do_ping_and_sendnode_requests(dht, &dht_friend->lastgetnode, dht_friend->public_key, dht_friend->client_list,
|
|
MAX_FRIEND_CLIENTS,
|
|
&dht_friend->bootstrap_times, 1);
|
|
}
|
|
}
|
|
|
|
/** Ping each client in the close nodes list every PING_INTERVAL seconds.
|
|
* Send a get nodes request every GET_NODE_INTERVAL seconds to a random good node in the list.
|
|
*/
|
|
non_null()
|
|
static void do_Close(DHT *dht)
|
|
{
|
|
for (size_t i = 0; i < dht->num_to_bootstrap; ++i) {
|
|
dht_getnodes(dht, &dht->to_bootstrap[i].ip_port, dht->to_bootstrap[i].public_key, dht->self_public_key);
|
|
}
|
|
|
|
dht->num_to_bootstrap = 0;
|
|
|
|
uint8_t not_killed = do_ping_and_sendnode_requests(
|
|
dht, &dht->close_lastgetnodes, dht->self_public_key, dht->close_clientlist, LCLIENT_LIST, &dht->close_bootstrap_times,
|
|
0);
|
|
|
|
if (not_killed != 0) {
|
|
return;
|
|
}
|
|
|
|
/* all existing nodes are at least KILL_NODE_TIMEOUT,
|
|
* which means we are mute, as we only send packets to
|
|
* nodes NOT in KILL_NODE_TIMEOUT
|
|
*
|
|
* so: reset all nodes to be BAD_NODE_TIMEOUT, but not
|
|
* KILL_NODE_TIMEOUT, so we at least keep trying pings */
|
|
const uint64_t badonly = mono_time_get(dht->mono_time) - BAD_NODE_TIMEOUT;
|
|
|
|
for (size_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
Client_data *const client = &dht->close_clientlist[i];
|
|
|
|
IPPTsPng *const assocs[] = { &client->assoc6, &client->assoc4, nullptr };
|
|
|
|
for (IPPTsPng * const *it = assocs; *it; ++it) {
|
|
IPPTsPng *const assoc = *it;
|
|
|
|
if (assoc->timestamp) {
|
|
assoc->timestamp = badonly;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void dht_bootstrap(DHT *dht, const IP_Port *ip_port, const uint8_t *public_key)
|
|
{
|
|
dht_getnodes(dht, ip_port, public_key, dht->self_public_key);
|
|
}
|
|
|
|
int dht_bootstrap_from_address(DHT *dht, const char *address, uint8_t ipv6enabled,
|
|
uint16_t port, const uint8_t *public_key)
|
|
{
|
|
IP_Port ip_port_v64;
|
|
IP *ip_extra = nullptr;
|
|
IP_Port ip_port_v4;
|
|
ip_init(&ip_port_v64.ip, ipv6enabled);
|
|
|
|
if (ipv6enabled) {
|
|
/* setup for getting BOTH: an IPv6 AND an IPv4 address */
|
|
ip_port_v64.ip.family = net_family_unspec;
|
|
ip_reset(&ip_port_v4.ip);
|
|
ip_extra = &ip_port_v4.ip;
|
|
}
|
|
|
|
if (addr_resolve_or_parse_ip(address, &ip_port_v64.ip, ip_extra)) {
|
|
ip_port_v64.port = port;
|
|
dht_bootstrap(dht, &ip_port_v64, public_key);
|
|
|
|
if ((ip_extra != nullptr) && ip_isset(ip_extra)) {
|
|
ip_port_v4.port = port;
|
|
dht_bootstrap(dht, &ip_port_v4, public_key);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Send the given packet to node with public_key.
|
|
*
|
|
* return -1 if failure.
|
|
*/
|
|
int route_packet(const DHT *dht, const uint8_t *public_key, const uint8_t *packet, uint16_t length)
|
|
{
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
if (id_equal(public_key, dht->close_clientlist[i].public_key)) {
|
|
const Client_data *const client = &dht->close_clientlist[i];
|
|
const IPPTsPng *const assocs[] = { &client->assoc6, &client->assoc4, nullptr };
|
|
|
|
for (const IPPTsPng * const *it = assocs; *it; ++it) {
|
|
const IPPTsPng *const assoc = *it;
|
|
|
|
if (ip_isset(&assoc->ip_port.ip)) {
|
|
return sendpacket(dht->net, &assoc->ip_port, packet, length);
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** Puts all the different ips returned by the nodes for a friend_num into array ip_portlist.
|
|
* ip_portlist must be at least MAX_FRIEND_CLIENTS big.
|
|
*
|
|
* return the number of ips returned.
|
|
* return 0 if we are connected to friend or if no ips were found.
|
|
* return -1 if no such friend.
|
|
*/
|
|
non_null()
|
|
static int friend_iplist(const DHT *dht, IP_Port *ip_portlist, uint16_t friend_num)
|
|
{
|
|
if (friend_num >= dht->num_friends) {
|
|
return -1;
|
|
}
|
|
|
|
const DHT_Friend *const dht_friend = &dht->friends_list[friend_num];
|
|
IP_Port ipv4s[MAX_FRIEND_CLIENTS];
|
|
int num_ipv4s = 0;
|
|
IP_Port ipv6s[MAX_FRIEND_CLIENTS];
|
|
int num_ipv6s = 0;
|
|
|
|
for (size_t i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
|
|
const Client_data *const client = &dht_friend->client_list[i];
|
|
|
|
/* If ip is not zero and node is good. */
|
|
if (ip_isset(&client->assoc4.ret_ip_port.ip)
|
|
&& !mono_time_is_timeout(dht->mono_time, client->assoc4.ret_timestamp, BAD_NODE_TIMEOUT)) {
|
|
ipv4s[num_ipv4s] = client->assoc4.ret_ip_port;
|
|
++num_ipv4s;
|
|
}
|
|
|
|
if (ip_isset(&client->assoc6.ret_ip_port.ip)
|
|
&& !mono_time_is_timeout(dht->mono_time, client->assoc6.ret_timestamp, BAD_NODE_TIMEOUT)) {
|
|
ipv6s[num_ipv6s] = client->assoc6.ret_ip_port;
|
|
++num_ipv6s;
|
|
}
|
|
|
|
if (id_equal(client->public_key, dht_friend->public_key)) {
|
|
if (!assoc_timeout(dht->cur_time, &client->assoc6)
|
|
|| !assoc_timeout(dht->cur_time, &client->assoc4)) {
|
|
return 0; /* direct connectivity */
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef FRIEND_IPLIST_PAD
|
|
memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
|
|
|
|
if (num_ipv6s == MAX_FRIEND_CLIENTS) {
|
|
return MAX_FRIEND_CLIENTS;
|
|
}
|
|
|
|
int num_ipv4s_used = MAX_FRIEND_CLIENTS - num_ipv6s;
|
|
|
|
if (num_ipv4s_used > num_ipv4s) {
|
|
num_ipv4s_used = num_ipv4s;
|
|
}
|
|
|
|
memcpy(&ip_portlist[num_ipv6s], ipv4s, num_ipv4s_used * sizeof(IP_Port));
|
|
return num_ipv6s + num_ipv4s_used;
|
|
|
|
#else /* !FRIEND_IPLIST_PAD */
|
|
|
|
/* there must be some secret reason why we can't pad the longer list
|
|
* with the shorter one...
|
|
*/
|
|
if (num_ipv6s >= num_ipv4s) {
|
|
memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
|
|
return num_ipv6s;
|
|
}
|
|
|
|
memcpy(ip_portlist, ipv4s, num_ipv4s * sizeof(IP_Port));
|
|
return num_ipv4s;
|
|
|
|
#endif /* !FRIEND_IPLIST_PAD */
|
|
}
|
|
|
|
|
|
/**
|
|
* Callback invoked for each IP/port of each client of a friend.
|
|
*
|
|
* For each client, the callback is invoked twice: once for IPv4 and once for
|
|
* IPv6. If the callback returns `false` after the IPv4 invocation, it will not
|
|
* be invoked for IPv6.
|
|
*
|
|
* @param dht The main DHT instance.
|
|
* @param ip_port The currently processed IP/port.
|
|
* @param n A pointer to the number that will be returned from `foreach_ip_port`.
|
|
* @param userdata The `userdata` pointer passed to `foreach_ip_port`.
|
|
*/
|
|
typedef bool foreach_ip_port_cb(const DHT *dht, const IP_Port *ip_port, uint32_t *n, void *userdata);
|
|
|
|
/**
|
|
* Runs a callback on every active connection for a given DHT friend.
|
|
*
|
|
* This iterates over the client list of a DHT friend and invokes a callback for
|
|
* every non-zero IP/port (IPv4 and IPv6) that's not timed out.
|
|
*
|
|
* @param dht The main DHT instance, passed to the callback.
|
|
* @param dht_friend The friend over whose connections we should iterate.
|
|
* @param callback The callback to invoke for each IP/port.
|
|
* @param userdata Extra pointer passed to the callback.
|
|
*/
|
|
non_null()
|
|
static uint32_t foreach_ip_port(const DHT *dht, const DHT_Friend *dht_friend,
|
|
foreach_ip_port_cb *callback, void *userdata)
|
|
{
|
|
uint32_t n = 0;
|
|
|
|
/* extra legwork, because having the outside allocating the space for us
|
|
* is *usually* good(tm) (bites us in the behind in this case though) */
|
|
for (uint32_t i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
|
|
const Client_data *const client = &dht_friend->client_list[i];
|
|
const IPPTsPng *const assocs[] = { &client->assoc4, &client->assoc6, nullptr };
|
|
|
|
for (const IPPTsPng * const *it = assocs; *it != nullptr; ++it) {
|
|
const IPPTsPng *const assoc = *it;
|
|
|
|
/* If ip is not zero and node is good. */
|
|
if (!ip_isset(&assoc->ret_ip_port.ip)
|
|
&& !mono_time_is_timeout(dht->mono_time, assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
|
|
continue;
|
|
}
|
|
|
|
if (!callback(dht, &assoc->ip_port, &n, userdata)) {
|
|
/* If the callback is happy with just one of the assocs, we
|
|
* don't give it the second one. */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
non_null()
|
|
static bool send_packet_to_friend(const DHT *dht, const IP_Port *ip_port, uint32_t *n, void *userdata)
|
|
{
|
|
const Packet *packet = (const Packet *)userdata;
|
|
const int retval = send_packet(dht->net, ip_port, *packet);
|
|
|
|
if ((uint32_t)retval == packet->length) {
|
|
++*n;
|
|
/* Send one packet per friend: stop the foreach on the first success. */
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Send the following packet to everyone who tells us they are connected to friend_id.
|
|
*
|
|
* return ip for friend.
|
|
* return number of nodes the packet was sent to. (Only works if more than (MAX_FRIEND_CLIENTS / 4).
|
|
*/
|
|
uint32_t route_to_friend(const DHT *dht, const uint8_t *friend_id, const Packet *packet)
|
|
{
|
|
const uint32_t num = index_of_friend_pk(dht->friends_list, dht->num_friends, friend_id);
|
|
|
|
if (num == UINT32_MAX) {
|
|
return 0;
|
|
}
|
|
|
|
|
|
IP_Port ip_list[MAX_FRIEND_CLIENTS];
|
|
const int ip_num = friend_iplist(dht, ip_list, num);
|
|
|
|
if (ip_num < MAX_FRIEND_CLIENTS / 4) {
|
|
return 0; /* Reason for that? */
|
|
}
|
|
|
|
const DHT_Friend *const dht_friend = &dht->friends_list[num];
|
|
Packet packet_userdata = *packet; // Copy because it needs to be non-const.
|
|
|
|
return foreach_ip_port(dht, dht_friend, send_packet_to_friend, &packet_userdata);
|
|
}
|
|
|
|
non_null()
|
|
static bool get_ip_port(const DHT *dht, const IP_Port *ip_port, uint32_t *n, void *userdata)
|
|
{
|
|
IP_Port *ip_list = (IP_Port *)userdata;
|
|
ip_list[*n] = *ip_port;
|
|
++*n;
|
|
return true;
|
|
}
|
|
|
|
/** Send the following packet to one random person who tells us they are connected to friend_id.
|
|
*
|
|
* return number of nodes the packet was sent to.
|
|
*/
|
|
non_null()
|
|
static uint32_t routeone_to_friend(const DHT *dht, const uint8_t *friend_id, const Packet *packet)
|
|
{
|
|
const uint32_t num = index_of_friend_pk(dht->friends_list, dht->num_friends, friend_id);
|
|
|
|
if (num == UINT32_MAX) {
|
|
return 0;
|
|
}
|
|
|
|
const DHT_Friend *const dht_friend = &dht->friends_list[num];
|
|
|
|
IP_Port ip_list[MAX_FRIEND_CLIENTS * 2];
|
|
|
|
const int n = foreach_ip_port(dht, dht_friend, get_ip_port, ip_list);
|
|
|
|
if (n < 1) {
|
|
return 0;
|
|
}
|
|
|
|
const uint32_t rand_idx = random_range_u32(n);
|
|
const int retval = send_packet(dht->net, &ip_list[rand_idx], *packet);
|
|
|
|
if ((unsigned int)retval == packet->length) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------------*/
|
|
/*---------------------BEGINNING OF NAT PUNCHING FUNCTIONS--------------------------*/
|
|
|
|
non_null()
|
|
static int send_NATping(const DHT *dht, const uint8_t *public_key, uint64_t ping_id, uint8_t type)
|
|
{
|
|
uint8_t data[sizeof(uint64_t) + 1];
|
|
uint8_t packet_data[MAX_CRYPTO_REQUEST_SIZE];
|
|
|
|
data[0] = type;
|
|
memcpy(data + 1, &ping_id, sizeof(uint64_t));
|
|
/* 254 is NAT ping request packet id */
|
|
const int len = create_request(
|
|
dht->self_public_key, dht->self_secret_key, packet_data, public_key, data,
|
|
sizeof(uint64_t) + 1, CRYPTO_PACKET_NAT_PING);
|
|
|
|
if (len == -1) {
|
|
return -1;
|
|
}
|
|
|
|
assert(len <= UINT16_MAX);
|
|
uint32_t num = 0;
|
|
const Packet packet = {packet_data, (uint16_t)len};
|
|
|
|
if (type == 0) { /* If packet is request use many people to route it. */
|
|
num = route_to_friend(dht, public_key, &packet);
|
|
} else if (type == 1) { /* If packet is response use only one person to route it */
|
|
num = routeone_to_friend(dht, public_key, &packet);
|
|
}
|
|
|
|
if (num == 0) {
|
|
return -1;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
/** Handle a received ping request for. */
|
|
non_null()
|
|
static int handle_NATping(void *object, const IP_Port *source, const uint8_t *source_pubkey, const uint8_t *packet,
|
|
uint16_t length, void *userdata)
|
|
{
|
|
if (length != sizeof(uint64_t) + 1) {
|
|
return 1;
|
|
}
|
|
|
|
DHT *const dht = (DHT *)object;
|
|
uint64_t ping_id;
|
|
memcpy(&ping_id, packet + 1, sizeof(uint64_t));
|
|
|
|
uint32_t friendnumber = index_of_friend_pk(dht->friends_list, dht->num_friends, source_pubkey);
|
|
|
|
if (friendnumber == UINT32_MAX) {
|
|
return 1;
|
|
}
|
|
|
|
DHT_Friend *const dht_friend = &dht->friends_list[friendnumber];
|
|
|
|
if (packet[0] == NAT_PING_REQUEST) {
|
|
/* 1 is reply */
|
|
send_NATping(dht, source_pubkey, ping_id, NAT_PING_RESPONSE);
|
|
dht_friend->nat.recv_nat_ping_timestamp = mono_time_get(dht->mono_time);
|
|
return 0;
|
|
}
|
|
|
|
if (packet[0] == NAT_PING_RESPONSE) {
|
|
if (dht_friend->nat.nat_ping_id == ping_id) {
|
|
dht_friend->nat.nat_ping_id = random_u64();
|
|
dht_friend->nat.hole_punching = 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/** Get the most common ip in the ip_portlist.
|
|
* Only return ip if it appears in list min_num or more.
|
|
* len must not be bigger than MAX_FRIEND_CLIENTS.
|
|
*
|
|
* return ip of 0 if failure.
|
|
*/
|
|
non_null()
|
|
static IP nat_commonip(const IP_Port *ip_portlist, uint16_t len, uint16_t min_num)
|
|
{
|
|
IP zero;
|
|
ip_reset(&zero);
|
|
|
|
if (len > MAX_FRIEND_CLIENTS) {
|
|
return zero;
|
|
}
|
|
|
|
uint16_t numbers[MAX_FRIEND_CLIENTS] = {0};
|
|
|
|
for (uint32_t i = 0; i < len; ++i) {
|
|
for (uint32_t j = 0; j < len; ++j) {
|
|
if (ip_equal(&ip_portlist[i].ip, &ip_portlist[j].ip)) {
|
|
++numbers[i];
|
|
}
|
|
}
|
|
|
|
if (numbers[i] >= min_num) {
|
|
return ip_portlist[i].ip;
|
|
}
|
|
}
|
|
|
|
return zero;
|
|
}
|
|
|
|
/** Return all the ports for one ip in a list.
|
|
* portlist must be at least len long,
|
|
* where len is the length of ip_portlist.
|
|
*
|
|
* return number of ports and puts the list of ports in portlist.
|
|
*/
|
|
non_null()
|
|
static uint16_t nat_getports(uint16_t *portlist, const IP_Port *ip_portlist, uint16_t len, const IP *ip)
|
|
{
|
|
uint16_t num = 0;
|
|
|
|
for (uint32_t i = 0; i < len; ++i) {
|
|
if (ip_equal(&ip_portlist[i].ip, ip)) {
|
|
portlist[num] = net_ntohs(ip_portlist[i].port);
|
|
++num;
|
|
}
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
non_null()
|
|
static void punch_holes(DHT *dht, const IP *ip, const uint16_t *port_list, uint16_t numports, uint16_t friend_num)
|
|
{
|
|
if (!dht->hole_punching_enabled) {
|
|
return;
|
|
}
|
|
|
|
if (numports > MAX_FRIEND_CLIENTS || numports == 0) {
|
|
return;
|
|
}
|
|
|
|
const uint16_t first_port = port_list[0];
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < numports; ++i) {
|
|
if (first_port != port_list[i]) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == numports) { /* If all ports are the same, only try that one port. */
|
|
IP_Port pinging;
|
|
ip_copy(&pinging.ip, ip);
|
|
pinging.port = net_htons(first_port);
|
|
ping_send_request(dht->ping, &pinging, dht->friends_list[friend_num].public_key);
|
|
} else {
|
|
for (i = 0; i < MAX_PUNCHING_PORTS; ++i) {
|
|
/* TODO(irungentoo): Improve port guessing algorithm. */
|
|
const uint32_t it = i + dht->friends_list[friend_num].nat.punching_index;
|
|
const int8_t sign = (it % 2) ? -1 : 1;
|
|
const uint32_t delta = sign * (it / (2 * numports));
|
|
const uint32_t index = (it / 2) % numports;
|
|
const uint16_t port = port_list[index] + delta;
|
|
IP_Port pinging;
|
|
ip_copy(&pinging.ip, ip);
|
|
pinging.port = net_htons(port);
|
|
ping_send_request(dht->ping, &pinging, dht->friends_list[friend_num].public_key);
|
|
}
|
|
|
|
dht->friends_list[friend_num].nat.punching_index += i;
|
|
}
|
|
|
|
if (dht->friends_list[friend_num].nat.tries > MAX_NORMAL_PUNCHING_TRIES) {
|
|
const uint16_t port = 1024;
|
|
IP_Port pinging;
|
|
ip_copy(&pinging.ip, ip);
|
|
|
|
for (i = 0; i < MAX_PUNCHING_PORTS; ++i) {
|
|
uint32_t it = i + dht->friends_list[friend_num].nat.punching_index2;
|
|
pinging.port = net_htons(port + it);
|
|
ping_send_request(dht->ping, &pinging, dht->friends_list[friend_num].public_key);
|
|
}
|
|
|
|
dht->friends_list[friend_num].nat.punching_index2 += i - (MAX_PUNCHING_PORTS / 2);
|
|
}
|
|
|
|
++dht->friends_list[friend_num].nat.tries;
|
|
}
|
|
|
|
non_null()
|
|
static void do_NAT(DHT *dht)
|
|
{
|
|
const uint64_t temp_time = mono_time_get(dht->mono_time);
|
|
|
|
for (uint32_t i = 0; i < dht->num_friends; ++i) {
|
|
IP_Port ip_list[MAX_FRIEND_CLIENTS];
|
|
const int num = friend_iplist(dht, ip_list, i);
|
|
|
|
/* If already connected or friend is not online don't try to hole punch. */
|
|
if (num < MAX_FRIEND_CLIENTS / 2) {
|
|
continue;
|
|
}
|
|
|
|
if (dht->friends_list[i].nat.nat_ping_timestamp + PUNCH_INTERVAL < temp_time) {
|
|
send_NATping(dht, dht->friends_list[i].public_key, dht->friends_list[i].nat.nat_ping_id, NAT_PING_REQUEST);
|
|
dht->friends_list[i].nat.nat_ping_timestamp = temp_time;
|
|
}
|
|
|
|
if (dht->friends_list[i].nat.hole_punching == 1 &&
|
|
dht->friends_list[i].nat.punching_timestamp + PUNCH_INTERVAL < temp_time &&
|
|
dht->friends_list[i].nat.recv_nat_ping_timestamp + PUNCH_INTERVAL * 2 >= temp_time) {
|
|
|
|
const IP ip = nat_commonip(ip_list, num, MAX_FRIEND_CLIENTS / 2);
|
|
|
|
if (!ip_isset(&ip)) {
|
|
continue;
|
|
}
|
|
|
|
if (dht->friends_list[i].nat.punching_timestamp + PUNCH_RESET_TIME < temp_time) {
|
|
dht->friends_list[i].nat.tries = 0;
|
|
dht->friends_list[i].nat.punching_index = 0;
|
|
dht->friends_list[i].nat.punching_index2 = 0;
|
|
}
|
|
|
|
uint16_t port_list[MAX_FRIEND_CLIENTS];
|
|
const uint16_t numports = nat_getports(port_list, ip_list, num, &ip);
|
|
punch_holes(dht, &ip, port_list, numports, i);
|
|
|
|
dht->friends_list[i].nat.punching_timestamp = temp_time;
|
|
dht->friends_list[i].nat.hole_punching = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------------*/
|
|
/*-----------------------END OF NAT PUNCHING FUNCTIONS------------------------------*/
|
|
|
|
/** Put up to max_num nodes in nodes from the closelist.
|
|
*
|
|
* return the number of nodes.
|
|
*/
|
|
non_null()
|
|
static uint16_t list_nodes(const Client_data *list, size_t length, uint64_t cur_time,
|
|
Node_format *nodes, uint16_t max_num)
|
|
{
|
|
if (max_num == 0) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t count = 0;
|
|
|
|
for (size_t i = length; i != 0; --i) {
|
|
const IPPTsPng *assoc = nullptr;
|
|
|
|
if (!assoc_timeout(cur_time, &list[i - 1].assoc4)) {
|
|
assoc = &list[i - 1].assoc4;
|
|
}
|
|
|
|
if (!assoc_timeout(cur_time, &list[i - 1].assoc6)) {
|
|
if (assoc == nullptr) {
|
|
assoc = &list[i - 1].assoc6;
|
|
} else if (random_u08() % 2) {
|
|
assoc = &list[i - 1].assoc6;
|
|
}
|
|
}
|
|
|
|
if (assoc != nullptr) {
|
|
memcpy(nodes[count].public_key, list[i - 1].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
nodes[count].ip_port = assoc->ip_port;
|
|
++count;
|
|
|
|
if (count >= max_num) {
|
|
return count;
|
|
}
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/** Put up to max_num nodes in nodes from the random friends.
|
|
*
|
|
* return the number of nodes.
|
|
*/
|
|
uint16_t randfriends_nodes(const DHT *dht, Node_format *nodes, uint16_t max_num)
|
|
{
|
|
if (max_num == 0) {
|
|
return 0;
|
|
}
|
|
|
|
uint16_t count = 0;
|
|
const uint32_t r = random_u32();
|
|
|
|
for (size_t i = 0; i < DHT_FAKE_FRIEND_NUMBER; ++i) {
|
|
count += list_nodes(dht->friends_list[(i + r) % DHT_FAKE_FRIEND_NUMBER].client_list, MAX_FRIEND_CLIENTS, dht->cur_time,
|
|
nodes + count, max_num - count);
|
|
|
|
if (count >= max_num) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/** Put up to max_num nodes in nodes from the closelist.
|
|
*
|
|
* return the number of nodes.
|
|
*/
|
|
uint16_t closelist_nodes(const DHT *dht, Node_format *nodes, uint16_t max_num)
|
|
{
|
|
return list_nodes(dht->close_clientlist, LCLIENT_LIST, dht->cur_time, nodes, max_num);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------------*/
|
|
|
|
void cryptopacket_registerhandler(DHT *dht, uint8_t byte, cryptopacket_handler_cb *cb, void *object)
|
|
{
|
|
dht->cryptopackethandlers[byte].function = cb;
|
|
dht->cryptopackethandlers[byte].object = object;
|
|
}
|
|
|
|
non_null()
|
|
static int cryptopacket_handle(void *object, const IP_Port *source, const uint8_t *packet, uint16_t length,
|
|
void *userdata)
|
|
{
|
|
DHT *const dht = (DHT *)object;
|
|
|
|
assert(packet[0] == NET_PACKET_CRYPTO);
|
|
|
|
if (length <= CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE + 1 + CRYPTO_MAC_SIZE ||
|
|
length > MAX_CRYPTO_REQUEST_SIZE + CRYPTO_MAC_SIZE) {
|
|
return 1;
|
|
}
|
|
|
|
// Check if request is for us.
|
|
if (id_equal(packet + 1, dht->self_public_key)) {
|
|
uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE];
|
|
uint8_t data[MAX_CRYPTO_REQUEST_SIZE];
|
|
uint8_t number;
|
|
const int len = handle_request(dht->self_public_key, dht->self_secret_key, public_key,
|
|
data, &number, packet, length);
|
|
|
|
if (len == -1 || len == 0) {
|
|
return 1;
|
|
}
|
|
|
|
if (!dht->cryptopackethandlers[number].function) {
|
|
return 1;
|
|
}
|
|
|
|
return dht->cryptopackethandlers[number].function(
|
|
dht->cryptopackethandlers[number].object, source, public_key,
|
|
data, len, userdata);
|
|
}
|
|
|
|
/* If request is not for us, try routing it. */
|
|
const int retval = route_packet(dht, packet + 1, packet, length);
|
|
|
|
if ((unsigned int)retval == length) {
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------------------*/
|
|
|
|
DHT *new_dht(const Logger *log, Mono_Time *mono_time, Networking_Core *net, bool holepunching_enabled)
|
|
{
|
|
if (net == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
DHT *const dht = (DHT *)calloc(1, sizeof(DHT));
|
|
|
|
if (dht == nullptr) {
|
|
return nullptr;
|
|
}
|
|
|
|
dht->mono_time = mono_time;
|
|
dht->cur_time = mono_time_get(mono_time);
|
|
dht->log = log;
|
|
dht->net = net;
|
|
|
|
dht->hole_punching_enabled = holepunching_enabled;
|
|
|
|
dht->ping = ping_new(mono_time, dht);
|
|
|
|
if (dht->ping == nullptr) {
|
|
kill_dht(dht);
|
|
return nullptr;
|
|
}
|
|
|
|
networking_registerhandler(dht->net, NET_PACKET_GET_NODES, &handle_getnodes, dht);
|
|
networking_registerhandler(dht->net, NET_PACKET_SEND_NODES_IPV6, &handle_sendnodes_ipv6, dht);
|
|
networking_registerhandler(dht->net, NET_PACKET_CRYPTO, &cryptopacket_handle, dht);
|
|
cryptopacket_registerhandler(dht, CRYPTO_PACKET_NAT_PING, &handle_NATping, dht);
|
|
|
|
crypto_new_keypair(dht->self_public_key, dht->self_secret_key);
|
|
|
|
dht->dht_ping_array = ping_array_new(DHT_PING_ARRAY_SIZE, PING_TIMEOUT);
|
|
|
|
if (dht->dht_ping_array == nullptr) {
|
|
kill_dht(dht);
|
|
return nullptr;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER; ++i) {
|
|
uint8_t random_public_key_bytes[CRYPTO_PUBLIC_KEY_SIZE];
|
|
uint8_t random_secret_key_bytes[CRYPTO_SECRET_KEY_SIZE];
|
|
|
|
crypto_new_keypair(random_public_key_bytes, random_secret_key_bytes);
|
|
|
|
if (dht_addfriend(dht, random_public_key_bytes, nullptr, nullptr, 0, nullptr) != 0) {
|
|
kill_dht(dht);
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
return dht;
|
|
}
|
|
|
|
void do_dht(DHT *dht)
|
|
{
|
|
const uint64_t cur_time = mono_time_get(dht->mono_time);
|
|
|
|
if (dht->cur_time == cur_time) {
|
|
return;
|
|
}
|
|
|
|
dht->cur_time = cur_time;
|
|
|
|
// Load friends/clients if first call to do_dht
|
|
if (dht->loaded_num_nodes) {
|
|
dht_connect_after_load(dht);
|
|
}
|
|
|
|
do_Close(dht);
|
|
do_dht_friends(dht);
|
|
do_NAT(dht);
|
|
ping_iterate(dht->ping);
|
|
}
|
|
|
|
void kill_dht(DHT *dht)
|
|
{
|
|
networking_registerhandler(dht->net, NET_PACKET_GET_NODES, nullptr, nullptr);
|
|
networking_registerhandler(dht->net, NET_PACKET_SEND_NODES_IPV6, nullptr, nullptr);
|
|
cryptopacket_registerhandler(dht, CRYPTO_PACKET_NAT_PING, nullptr, nullptr);
|
|
ping_array_kill(dht->dht_ping_array);
|
|
ping_kill(dht->ping);
|
|
free(dht->friends_list);
|
|
free(dht->loaded_nodes_list);
|
|
crypto_memzero(&dht->shared_keys_recv, sizeof(dht->shared_keys_recv));
|
|
crypto_memzero(&dht->shared_keys_sent, sizeof(dht->shared_keys_sent));
|
|
crypto_memzero(dht->self_secret_key, sizeof(dht->self_secret_key));
|
|
free(dht);
|
|
}
|
|
|
|
/* new DHT format for load/save, more robust and forward compatible */
|
|
// TODO(irungentoo): Move this closer to Messenger.
|
|
#define DHT_STATE_COOKIE_GLOBAL 0x159000d
|
|
|
|
#define DHT_STATE_COOKIE_TYPE 0x11ce
|
|
#define DHT_STATE_TYPE_NODES 4
|
|
|
|
#define MAX_SAVED_DHT_NODES (((DHT_FAKE_FRIEND_NUMBER * MAX_FRIEND_CLIENTS) + LCLIENT_LIST) * 2)
|
|
|
|
/** Get the size of the DHT (for saving). */
|
|
uint32_t dht_size(const DHT *dht)
|
|
{
|
|
uint32_t numv4 = 0;
|
|
uint32_t numv6 = 0;
|
|
|
|
for (uint32_t i = 0; i < dht->loaded_num_nodes; ++i) {
|
|
numv4 += net_family_is_ipv4(dht->loaded_nodes_list[i].ip_port.ip.family);
|
|
numv6 += net_family_is_ipv6(dht->loaded_nodes_list[i].ip_port.ip.family);
|
|
}
|
|
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
numv4 += (dht->close_clientlist[i].assoc4.timestamp != 0);
|
|
numv6 += (dht->close_clientlist[i].assoc6.timestamp != 0);
|
|
}
|
|
|
|
for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER && i < dht->num_friends; ++i) {
|
|
const DHT_Friend *const fr = &dht->friends_list[i];
|
|
|
|
for (uint32_t j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
|
|
numv4 += (fr->client_list[j].assoc4.timestamp != 0);
|
|
numv6 += (fr->client_list[j].assoc6.timestamp != 0);
|
|
}
|
|
}
|
|
|
|
const uint32_t size32 = sizeof(uint32_t);
|
|
const uint32_t sizesubhead = size32 * 2;
|
|
|
|
return size32 + sizesubhead + packed_node_size(net_family_ipv4) * numv4 + packed_node_size(net_family_ipv6) * numv6;
|
|
}
|
|
|
|
/** Save the DHT in data where data is an array of size dht_size(). */
|
|
void dht_save(const DHT *dht, uint8_t *data)
|
|
{
|
|
host_to_lendian_bytes32(data, DHT_STATE_COOKIE_GLOBAL);
|
|
data += sizeof(uint32_t);
|
|
|
|
uint8_t *const old_data = data;
|
|
|
|
/* get right offset. we write the actual header later. */
|
|
data = state_write_section_header(data, DHT_STATE_COOKIE_TYPE, 0, 0);
|
|
|
|
Node_format *clients = (Node_format *)calloc(MAX_SAVED_DHT_NODES, sizeof(Node_format));
|
|
|
|
if (clients == nullptr) {
|
|
LOGGER_ERROR(dht->log, "could not allocate %u nodes", MAX_SAVED_DHT_NODES);
|
|
return;
|
|
}
|
|
|
|
uint32_t num = 0;
|
|
|
|
if (dht->loaded_num_nodes > 0) {
|
|
memcpy(clients, dht->loaded_nodes_list, sizeof(Node_format) * dht->loaded_num_nodes);
|
|
num += dht->loaded_num_nodes;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
if (dht->close_clientlist[i].assoc4.timestamp != 0) {
|
|
memcpy(clients[num].public_key, dht->close_clientlist[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
clients[num].ip_port = dht->close_clientlist[i].assoc4.ip_port;
|
|
++num;
|
|
}
|
|
|
|
if (dht->close_clientlist[i].assoc6.timestamp != 0) {
|
|
memcpy(clients[num].public_key, dht->close_clientlist[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
clients[num].ip_port = dht->close_clientlist[i].assoc6.ip_port;
|
|
++num;
|
|
}
|
|
}
|
|
|
|
for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER && i < dht->num_friends; ++i) {
|
|
const DHT_Friend *const fr = &dht->friends_list[i];
|
|
|
|
for (uint32_t j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
|
|
if (fr->client_list[j].assoc4.timestamp != 0) {
|
|
memcpy(clients[num].public_key, fr->client_list[j].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
clients[num].ip_port = fr->client_list[j].assoc4.ip_port;
|
|
++num;
|
|
}
|
|
|
|
if (fr->client_list[j].assoc6.timestamp != 0) {
|
|
memcpy(clients[num].public_key, fr->client_list[j].public_key, CRYPTO_PUBLIC_KEY_SIZE);
|
|
clients[num].ip_port = fr->client_list[j].assoc6.ip_port;
|
|
++num;
|
|
}
|
|
}
|
|
}
|
|
|
|
state_write_section_header(old_data, DHT_STATE_COOKIE_TYPE, pack_nodes(data, sizeof(Node_format) * num, clients, num),
|
|
DHT_STATE_TYPE_NODES);
|
|
|
|
free(clients);
|
|
}
|
|
|
|
/** Bootstrap from this number of nodes every time dht_connect_after_load() is called */
|
|
#define SAVE_BOOTSTAP_FREQUENCY 8
|
|
|
|
/** Start sending packets after DHT loaded_friends_list and loaded_clients_list are set.
|
|
*
|
|
* returns 0 if successful
|
|
* returns -1 otherwise
|
|
*/
|
|
int dht_connect_after_load(DHT *dht)
|
|
{
|
|
if (dht == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
if (!dht->loaded_nodes_list) {
|
|
return -1;
|
|
}
|
|
|
|
/* DHT is connected, stop. */
|
|
if (dht_non_lan_connected(dht)) {
|
|
free(dht->loaded_nodes_list);
|
|
dht->loaded_nodes_list = nullptr;
|
|
dht->loaded_num_nodes = 0;
|
|
return 0;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < dht->loaded_num_nodes && i < SAVE_BOOTSTAP_FREQUENCY; ++i) {
|
|
const unsigned int index = dht->loaded_nodes_index % dht->loaded_num_nodes;
|
|
dht_bootstrap(dht, &dht->loaded_nodes_list[index].ip_port, dht->loaded_nodes_list[index].public_key);
|
|
++dht->loaded_nodes_index;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
non_null()
|
|
static State_Load_Status dht_load_state_callback(void *outer, const uint8_t *data, uint32_t length, uint16_t type)
|
|
{
|
|
DHT *dht = (DHT *)outer;
|
|
|
|
switch (type) {
|
|
case DHT_STATE_TYPE_NODES: {
|
|
if (length == 0) {
|
|
break;
|
|
}
|
|
|
|
free(dht->loaded_nodes_list);
|
|
// Copy to loaded_clients_list
|
|
dht->loaded_nodes_list = (Node_format *)calloc(MAX_SAVED_DHT_NODES, sizeof(Node_format));
|
|
|
|
if (dht->loaded_nodes_list == nullptr) {
|
|
LOGGER_ERROR(dht->log, "could not allocate %u nodes", MAX_SAVED_DHT_NODES);
|
|
dht->loaded_num_nodes = 0;
|
|
break;
|
|
}
|
|
|
|
const int num = unpack_nodes(dht->loaded_nodes_list, MAX_SAVED_DHT_NODES, nullptr, data, length, 0);
|
|
|
|
if (num > 0) {
|
|
dht->loaded_num_nodes = num;
|
|
} else {
|
|
dht->loaded_num_nodes = 0;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
LOGGER_ERROR(dht->log, "Load state (DHT): contains unrecognized part (len %u, type %u)",
|
|
length, type);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return STATE_LOAD_STATUS_CONTINUE;
|
|
}
|
|
|
|
/** Load the DHT from data of size size.
|
|
*
|
|
* return -1 if failure.
|
|
* return 0 if success.
|
|
*/
|
|
int dht_load(DHT *dht, const uint8_t *data, uint32_t length)
|
|
{
|
|
const uint32_t cookie_len = sizeof(uint32_t);
|
|
|
|
if (length > cookie_len) {
|
|
uint32_t data32;
|
|
lendian_bytes_to_host32(&data32, data);
|
|
|
|
if (data32 == DHT_STATE_COOKIE_GLOBAL) {
|
|
return state_load(dht->log, dht_load_state_callback, dht, data + cookie_len,
|
|
length - cookie_len, DHT_STATE_COOKIE_TYPE);
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/** return false if we are not connected to the DHT.
|
|
* return true if we are.
|
|
*/
|
|
bool dht_isconnected(const DHT *dht)
|
|
{
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
const Client_data *const client = &dht->close_clientlist[i];
|
|
|
|
if (!assoc_timeout(dht->cur_time, &client->assoc4) ||
|
|
!assoc_timeout(dht->cur_time, &client->assoc6)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/** return false if we are not connected or only connected to lan peers with the DHT.
|
|
* return true if we are.
|
|
*/
|
|
bool dht_non_lan_connected(const DHT *dht)
|
|
{
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
const Client_data *const client = &dht->close_clientlist[i];
|
|
|
|
if (!assoc_timeout(dht->cur_time, &client->assoc4)
|
|
&& !ip_is_lan(&client->assoc4.ip_port.ip)) {
|
|
return true;
|
|
}
|
|
|
|
if (!assoc_timeout(dht->cur_time, &client->assoc6)
|
|
&& !ip_is_lan(&client->assoc6.ip_port.ip)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/** Copies our own ip_port structure to `dest`. WAN addresses take priority over LAN addresses.
|
|
*
|
|
* This function will zero the `dest` buffer before use.
|
|
*
|
|
* Return 0 if our ip port can't be found (this usually means we're not connected to the DHT).
|
|
* Return 1 if IP is a WAN address.
|
|
* Return 2 if IP is a LAN address.
|
|
*/
|
|
unsigned int ipport_self_copy(const DHT *dht, IP_Port *dest)
|
|
{
|
|
ipport_reset(dest);
|
|
|
|
bool is_lan = false;
|
|
|
|
for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
|
|
const Client_data *client = dht_get_close_client(dht, i);
|
|
const IP_Port *ip_port4 = &client->assoc4.ret_ip_port;
|
|
|
|
if (client->assoc4.ret_ip_self && ipport_isset(ip_port4)) {
|
|
ipport_copy(dest, ip_port4);
|
|
is_lan = ip_is_lan(&dest->ip);
|
|
|
|
if (!is_lan) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
const IP_Port *ip_port6 = &client->assoc6.ret_ip_port;
|
|
|
|
if (client->assoc6.ret_ip_self && ipport_isset(ip_port6)) {
|
|
ipport_copy(dest, ip_port6);
|
|
is_lan = ip_is_lan(&dest->ip);
|
|
|
|
if (!is_lan) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!ipport_isset(dest)) {
|
|
return 0;
|
|
}
|
|
|
|
if (is_lan) {
|
|
return 2;
|
|
}
|
|
|
|
return 1;
|
|
}
|